diff --git a/core/dr-sync-nextcloud/src/lib.rs b/core/dr-sync-nextcloud/src/lib.rs
index ad93db0..bac7816 100644
--- a/core/dr-sync-nextcloud/src/lib.rs
+++ b/core/dr-sync-nextcloud/src/lib.rs
@@ -121,16 +121,24 @@ impl NextcloudBackend {
         body: Vec<u8>,
     ) -> Result<Validator, RemoteError> {
         let total = body.len() as u64;
-        // Named from the destination so a resumed or abandoned upload is
-        // identifiable, and so two uploads cannot collide in one directory.
-        let token: String = path
-            .as_str()
-            .bytes()
-            .map(|b| match b {
-                b'A'..=b'Z' | b'a'..=b'z' | b'0'..=b'9' => (b as char).to_string(),
-                _ => "-".to_string(),
-            })
-            .collect();
+        // TRACES: FR-NC-9
+        // Named from the destination, so an abandoned upload is identifiable,
+        // **and from a nonce, so no two uploads ever share a directory.**
+        //
+        // The name used to be the destination alone, on the reasoning that two
+        // *files* could then not collide. Two *devices* uploading the same file
+        // could, and did: both wrote `00001`…`00009` into one directory, and
+        // whichever `MOVE`d first assembled a mix of the two — a catalog of
+        // exactly the right size whose pages came from two different
+        // databases. SQLite called it malformed, every client then declined to
+        // overwrite it, and collections stopped syncing on all of them for a
+        // week. An upload that died on a phone's link left its chunks there
+        // for the next device to assemble in, by the same mechanism.
+        let token = format!(
+            "{}-{}",
+            sanitise_for_upload_dir(path.as_str()),
+            upload_nonce()
+        );
         let dir = format!(
             "{}/remote.php/dav/uploads/{}/{token}",
             self.server, self.login
@@ -138,6 +146,27 @@ impl NextcloudBackend {
 
         self.mkcol_url(&dir).await?;
 
+        // Whatever happens below, the directory does not outlive the attempt.
+        // With a unique name a leftover is only quota rather than corruption,
+        // but a phone that abandons uploads all day would still leave dozens
+        // of 5 MB chunks behind, and the server only sweeps them eventually.
+        let result = self.put_chunks_and_assemble(path, &dir, body, total).await;
+        if result.is_err() {
+            self.discard_upload_dir(&dir).await;
+        }
+        result
+    }
+
+    /// The transfer half of [`put_chunked`](Self::put_chunked): the chunks,
+    /// then the `MOVE` that assembles them. Split out so that a failure at any
+    /// point returns to one place that cleans up.
+    async fn put_chunks_and_assemble(
+        &self,
+        path: &RemotePath,
+        dir: &str,
+        body: Vec<u8>,
+        total: u64,
+    ) -> Result<Validator, RemoteError> {
         // Chunks are numbered from 1 and must sort correctly as strings, which
         // is why they are zero-padded rather than bare integers.
         let chunk_size = CHUNKS.min_chunk as usize;
@@ -191,6 +220,27 @@ impl NextcloudBackend {
         self.dir_validator(path).await
     }
 
+    /// Best-effort `DELETE` of an upload directory whose transfer failed.
+    ///
+    /// Errors are logged and dropped: this runs on the way out of a failure,
+    /// and the failure is what the caller needs to hear about. A connection
+    /// that has just died will refuse this too, and that is fine — the
+    /// server sweeps abandoned upload directories on its own; this only
+    /// spares it the wait when the link is still up.
+    async fn discard_upload_dir(&self, dir: &str) {
+        let attempt = self
+            .client
+            .delete(dir)
+            .basic_auth(&self.login, Some(&self.password))
+            .send()
+            .await;
+        match attempt {
+            Ok(resp) if resp.status().is_success() || resp.status() == 404 => {}
+            Ok(resp) => log::debug!("leaving abandoned upload {dir}: {}", resp.status()),
+            Err(e) => log::debug!("leaving abandoned upload {dir}: {e}"),
+        }
+    }
+
     /// `MKCOL` at an absolute URL, treating "already there" as success.
     async fn mkcol_url(&self, url: &str) -> Result<(), RemoteError> {
         let resp = self
@@ -725,6 +775,37 @@ fn map_send_error(e: reqwest::Error) -> RemoteError {
     }
 }
 
+/// The destination path reduced to characters every WebDAV server accepts in
+/// an upload directory name.
+fn sanitise_for_upload_dir(path: &str) -> String {
+    path.bytes()
+        .map(|b| match b {
+            b'A'..=b'Z' | b'a'..=b'z' | b'0'..=b'9' => (b as char).to_string(),
+            _ => "-".to_string(),
+        })
+        .collect()
+}
+
+/// A token no other upload — on this device or any other — will produce.
+///
+/// Nanoseconds since the epoch, the process id, and a counter, mixed rather
+/// than concatenated so the name stays short. Two devices would have to start
+/// an upload in the same nanosecond from the same pid to collide, and the
+/// counter separates two uploads this process starts in one tick. No
+/// randomness crate is pulled in for this: unique is the requirement, not
+/// unguessable.
+fn upload_nonce() -> String {
+    use std::sync::atomic::{AtomicU64, Ordering};
+    static COUNTER: AtomicU64 = AtomicU64::new(0);
+    let nanos = std::time::SystemTime::now()
+        .duration_since(std::time::UNIX_EPOCH)
+        .map(|d| d.as_nanos() as u64)
+        .unwrap_or(0);
+    let pid = u64::from(std::process::id());
+    let n = COUNTER.fetch_add(1, Ordering::Relaxed);
+    format!("{:016x}", nanos ^ (pid << 40) ^ n.rotate_left(20))
+}
+
 /// Translate an HTTP status into a typed error.
 fn map_status(status: reqwest::StatusCode, what: &str) -> Result<(), RemoteError> {
     match status.as_u16() {
@@ -765,6 +846,33 @@ fn encode_path(path: &str) -> String {
 
 #[cfg(test)]
 mod tests {
+    #[test]
+    fn two_uploads_of_one_destination_never_share_a_directory() {
+        // The collision that assembled two devices' chunks into one file.
+        // Same path, back to back, same process: still two names.
+        let a = format!(
+            "{}-{}",
+            super::sanitise_for_upload_dir("PhotosRaw/.darkroom-derived/catalog.sqlite"),
+            super::upload_nonce()
+        );
+        let b = format!(
+            "{}-{}",
+            super::sanitise_for_upload_dir("PhotosRaw/.darkroom-derived/catalog.sqlite"),
+            super::upload_nonce()
+        );
+        assert_ne!(a, b);
+        assert!(a.starts_with("PhotosRaw--darkroom-derived-catalog-sqlite-"));
+    }
+
+    #[test]
+    fn upload_directory_names_are_plain() {
+        assert_eq!(
+            super::sanitise_for_upload_dir("Photos Raw/été/x.sqlite"),
+            "Photos-Raw---t---x-sqlite"
+        );
+        assert!(super::upload_nonce().bytes().all(|b| b.is_ascii_hexdigit()));
+    }
+
     use super::*;
 
     fn backend() -> NextcloudBackend {
diff --git a/docs/traceability.md b/docs/traceability.md
index 0d04c29..c64ceca 100644
--- a/docs/traceability.md
+++ b/docs/traceability.md
@@ -10,7 +10,7 @@ Denominators are parsed from [`requirements.md`](requirements.md) at run time, n
 | Metric | Value |
 |---|---|
 | Source files scanned | 354 |
-| TRACES tags found | 1471 |
+| TRACES tags found | 1472 |
 | Requirements defined | 191 |
 | Requirements covered | 140 |
 | **Coverage** | **73.3%** (140/191) |
@@ -38,7 +38,7 @@ _None._
 | FR-CAT-11 | [`core/dr-catalog/src/dedup.rs:1`](../core/dr-catalog/src/dedup.rs#L1), [`core/dr-ingest/src/lib.rs:1`](../core/dr-ingest/src/lib.rs#L1), [`core/dr-ingest/src/lib.rs:392`](../core/dr-ingest/src/lib.rs#L392), [`core/dr-sync/src/upload.rs:40`](../core/dr-sync/src/upload.rs#L40), [`ui/dr-ui/src/import.rs:1`](../ui/dr-ui/src/import.rs#L1), [`ui/dr-ui/src/import_ui.rs:1`](../ui/dr-ui/src/import_ui.rs#L1), [`ui/dr-ui/src/lib.rs:1508`](../ui/dr-ui/src/lib.rs#L1508), [`ui/dr-ui/src/library.rs:183`](../ui/dr-ui/src/library.rs#L183), [`ui/dr-ui/src/library.rs:3047`](../ui/dr-ui/src/library.rs#L3047), [`ui/dr-ui/ui/import.slint:5`](../ui/dr-ui/ui/import.slint#L5) |
 | FR-CAT-12 | [`core/dr-pipeline/src/sidecar.rs:122`](../core/dr-pipeline/src/sidecar.rs#L122) |
 | FR-CAT-13 | [`core/dr-catalog/src/rating.rs:278`](../core/dr-catalog/src/rating.rs#L278), [`core/dr-catalog/src/schema.rs:653`](../core/dr-catalog/src/schema.rs#L653), [`core/dr-sync/src/scan.rs:40`](../core/dr-sync/src/scan.rs#L40), [`core/dr-sync/src/scan.rs:944`](../core/dr-sync/src/scan.rs#L944), [`core/dr-types/src/settings.rs:92`](../core/dr-types/src/settings.rs#L92), [`core/dr-xmp/src/lib.rs:1`](../core/dr-xmp/src/lib.rs#L1), [`core/dr-xmp/src/lib.rs:331`](../core/dr-xmp/src/lib.rs#L331), [`core/dr-xmp/src/lib.rs:442`](../core/dr-xmp/src/lib.rs#L442), [`core/dr-xmp/src/lib.rs:535`](../core/dr-xmp/src/lib.rs#L535), [`core/dr-xmp/src/lib.rs:733`](../core/dr-xmp/src/lib.rs#L733), [`core/dr-xmp/src/lib.rs:746`](../core/dr-xmp/src/lib.rs#L746), [`core/dr-xmp/src/read.rs:1`](../core/dr-xmp/src/read.rs#L1), [`core/dr-xmp/src/write.rs:1`](../core/dr-xmp/src/write.rs#L1), [`core/dr-xmp/tests/round_trip.rs:1`](../core/dr-xmp/tests/round_trip.rs#L1), [`ui/dr-ui/src/library.rs:1500`](../ui/dr-ui/src/library.rs#L1500), [`ui/dr-ui/src/library.rs:1563`](../ui/dr-ui/src/library.rs#L1563), [`ui/dr-ui/src/library.rs:1579`](../ui/dr-ui/src/library.rs#L1579), [`ui/dr-ui/src/library.rs:1686`](../ui/dr-ui/src/library.rs#L1686), [`ui/dr-ui/src/library_ui.rs:1285`](../ui/dr-ui/src/library_ui.rs#L1285), [`ui/dr-ui/src/library_ui.rs:301`](../ui/dr-ui/src/library_ui.rs#L301), [`ui/dr-ui/src/library_ui.rs:3411`](../ui/dr-ui/src/library_ui.rs#L3411), [`ui/dr-ui/src/library_ui.rs:3467`](../ui/dr-ui/src/library_ui.rs#L3467), [`ui/dr-ui/src/library_ui.rs:3565`](../ui/dr-ui/src/library_ui.rs#L3565), [`ui/dr-ui/src/library_ui.rs:387`](../ui/dr-ui/src/library_ui.rs#L387), [`ui/dr-ui/src/library_ui.rs:519`](../ui/dr-ui/src/library_ui.rs#L519), [`ui/dr-ui/src/library_ui.rs:5713`](../ui/dr-ui/src/library_ui.rs#L5713), [`ui/dr-ui/src/settings_ui.rs:506`](../ui/dr-ui/src/settings_ui.rs#L506), [`ui/dr-ui/src/xmp_sync.rs:1`](../ui/dr-ui/src/xmp_sync.rs#L1), [`ui/dr-ui/src/xmp_sync.rs:250`](../ui/dr-ui/src/xmp_sync.rs#L250), [`ui/dr-ui/src/xmp_sync.rs:287`](../ui/dr-ui/src/xmp_sync.rs#L287), [`ui/dr-ui/src/xmp_sync.rs:324`](../ui/dr-ui/src/xmp_sync.rs#L324), [`ui/dr-ui/ui/app.slint:849`](../ui/dr-ui/ui/app.slint#L849), [`ui/dr-ui/ui/settings.slint:1001`](../ui/dr-ui/ui/settings.slint#L1001), [`ui/dr-ui/ui/settings.slint:184`](../ui/dr-ui/ui/settings.slint#L184) |
-| FR-CAT-15 | [`core/dr-catalog/src/schema.rs:923`](../core/dr-catalog/src/schema.rs#L923), [`core/dr-catalog/src/trash.rs:1`](../core/dr-catalog/src/trash.rs#L1), [`core/dr-sync-nextcloud/src/lib.rs:457`](../core/dr-sync-nextcloud/src/lib.rs#L457), [`core/dr-sync/src/lib.rs:135`](../core/dr-sync/src/lib.rs#L135), [`core/dr-sync/src/scan.rs:618`](../core/dr-sync/src/scan.rs#L618), [`core/dr-sync/src/scan.rs:93`](../core/dr-sync/src/scan.rs#L93), [`core/dr-thumbs/src/lib.rs:376`](../core/dr-thumbs/src/lib.rs#L376), [`core/dr-types/src/place.rs:91`](../core/dr-types/src/place.rs#L91), [`ui/dr-ui/src/collections_ui.rs:1435`](../ui/dr-ui/src/collections_ui.rs#L1435), [`ui/dr-ui/src/collections_ui.rs:2341`](../ui/dr-ui/src/collections_ui.rs#L2341), [`ui/dr-ui/src/library.rs:183`](../ui/dr-ui/src/library.rs#L183), [`ui/dr-ui/src/library.rs:200`](../ui/dr-ui/src/library.rs#L200), [`ui/dr-ui/src/library.rs:249`](../ui/dr-ui/src/library.rs#L249), [`ui/dr-ui/src/library.rs:4829`](../ui/dr-ui/src/library.rs#L4829), [`ui/dr-ui/src/library.rs:4863`](../ui/dr-ui/src/library.rs#L4863), [`ui/dr-ui/src/library_ui.rs:238`](../ui/dr-ui/src/library_ui.rs#L238), [`ui/dr-ui/src/library_ui.rs:870`](../ui/dr-ui/src/library_ui.rs#L870), [`ui/dr-ui/src/trash.rs:1`](../ui/dr-ui/src/trash.rs#L1), [`ui/dr-ui/ui/collections.slint:745`](../ui/dr-ui/ui/collections.slint#L745) |
+| FR-CAT-15 | [`core/dr-catalog/src/schema.rs:923`](../core/dr-catalog/src/schema.rs#L923), [`core/dr-catalog/src/trash.rs:1`](../core/dr-catalog/src/trash.rs#L1), [`core/dr-sync-nextcloud/src/lib.rs:507`](../core/dr-sync-nextcloud/src/lib.rs#L507), [`core/dr-sync/src/lib.rs:135`](../core/dr-sync/src/lib.rs#L135), [`core/dr-sync/src/scan.rs:618`](../core/dr-sync/src/scan.rs#L618), [`core/dr-sync/src/scan.rs:93`](../core/dr-sync/src/scan.rs#L93), [`core/dr-thumbs/src/lib.rs:376`](../core/dr-thumbs/src/lib.rs#L376), [`core/dr-types/src/place.rs:91`](../core/dr-types/src/place.rs#L91), [`ui/dr-ui/src/collections_ui.rs:1435`](../ui/dr-ui/src/collections_ui.rs#L1435), [`ui/dr-ui/src/collections_ui.rs:2341`](../ui/dr-ui/src/collections_ui.rs#L2341), [`ui/dr-ui/src/library.rs:183`](../ui/dr-ui/src/library.rs#L183), [`ui/dr-ui/src/library.rs:200`](../ui/dr-ui/src/library.rs#L200), [`ui/dr-ui/src/library.rs:249`](../ui/dr-ui/src/library.rs#L249), [`ui/dr-ui/src/library.rs:4829`](../ui/dr-ui/src/library.rs#L4829), [`ui/dr-ui/src/library.rs:4863`](../ui/dr-ui/src/library.rs#L4863), [`ui/dr-ui/src/library_ui.rs:238`](../ui/dr-ui/src/library_ui.rs#L238), [`ui/dr-ui/src/library_ui.rs:870`](../ui/dr-ui/src/library_ui.rs#L870), [`ui/dr-ui/src/trash.rs:1`](../ui/dr-ui/src/trash.rs#L1), [`ui/dr-ui/ui/collections.slint:745`](../ui/dr-ui/ui/collections.slint#L745) |
 | FR-CAT-1a | [`core/dr-catalog/src/walk.rs:1`](../core/dr-catalog/src/walk.rs#L1), [`core/dr-types/src/lib.rs:56`](../core/dr-types/src/lib.rs#L56), [`platform/dr-plat/src/storage.rs:1`](../platform/dr-plat/src/storage.rs#L1), [`platform/dr-plat/src/storage.rs:216`](../platform/dr-plat/src/storage.rs#L216), [`platform/dr-plat/src/storage.rs:46`](../platform/dr-plat/src/storage.rs#L46) |
 | FR-CAT-2 | [`core/dr-catalog/src/lib.rs:1`](../core/dr-catalog/src/lib.rs#L1), [`core/dr-catalog/src/schema.rs:1`](../core/dr-catalog/src/schema.rs#L1) |
 | FR-CAT-3 | [`core/dr-catalog/src/jobs.rs:1`](../core/dr-catalog/src/jobs.rs#L1), [`core/dr-catalog/src/walk.rs:66`](../core/dr-catalog/src/walk.rs#L66), [`core/dr-sync/src/scan.rs:105`](../core/dr-sync/src/scan.rs#L105), [`core/dr-thumbs/src/codec.rs:1`](../core/dr-thumbs/src/codec.rs#L1), [`core/dr-thumbs/src/lib.rs:1`](../core/dr-thumbs/src/lib.rs#L1), [`ui/dr-ui/src/derived_sync.rs:1`](../ui/dr-ui/src/derived_sync.rs#L1), [`ui/dr-ui/src/import.rs:463`](../ui/dr-ui/src/import.rs#L463), [`ui/dr-ui/src/import.rs:488`](../ui/dr-ui/src/import.rs#L488), [`ui/dr-ui/src/library.rs:3520`](../ui/dr-ui/src/library.rs#L3520), [`ui/dr-ui/src/library.rs:4278`](../ui/dr-ui/src/library.rs#L4278), [`ui/dr-ui/src/library_ui.rs:177`](../ui/dr-ui/src/library_ui.rs#L177), [`ui/dr-ui/src/library_ui.rs:4463`](../ui/dr-ui/src/library_ui.rs#L4463), [`ui/dr-ui/src/library_ui.rs:5974`](../ui/dr-ui/src/library_ui.rs#L5974), [`ui/dr-ui/ui/app.slint:383`](../ui/dr-ui/ui/app.slint#L383), [`ui/dr-ui/ui/settings.slint:420`](../ui/dr-ui/ui/settings.slint#L420), [`ui/dr-ui/ui/settings.slint:73`](../ui/dr-ui/ui/settings.slint#L73) |
@@ -97,7 +97,7 @@ _None._
 | FR-EXP-9 | [`core/dr-decode/src/lib.rs:506`](../core/dr-decode/src/lib.rs#L506), [`core/dr-export/src/lib.rs:128`](../core/dr-export/src/lib.rs#L128), [`core/dr-export/src/lib.rs:1`](../core/dr-export/src/lib.rs#L1), [`core/dr-gpu/src/adjust.rs:1106`](../core/dr-gpu/src/adjust.rs#L1106), [`ui/dr-ui/examples/face_native.rs:1`](../ui/dr-ui/examples/face_native.rs#L1), [`ui/dr-ui/src/develop.rs:4672`](../ui/dr-ui/src/develop.rs#L4672), [`ui/dr-ui/src/develop.rs:4710`](../ui/dr-ui/src/develop.rs#L4710), [`ui/dr-ui/src/develop.rs:6878`](../ui/dr-ui/src/develop.rs#L6878), [`ui/dr-ui/src/lib.rs:601`](../ui/dr-ui/src/lib.rs#L601), [`ui/dr-ui/src/library.rs:3679`](../ui/dr-ui/src/library.rs#L3679), [`ui/dr-ui/src/library.rs:4092`](../ui/dr-ui/src/library.rs#L4092), [`ui/dr-ui/src/library.rs:4128`](../ui/dr-ui/src/library.rs#L4128), [`ui/dr-ui/tests/export_ignores_the_viewport.rs:1`](../ui/dr-ui/tests/export_ignores_the_viewport.rs#L1) |
 | FR-NC-1 | [`core/dr-sync-nextcloud/src/auth.rs:132`](../core/dr-sync-nextcloud/src/auth.rs#L132), [`core/dr-sync-nextcloud/src/auth.rs:44`](../core/dr-sync-nextcloud/src/auth.rs#L44), [`core/dr-sync-nextcloud/src/provider.rs:1`](../core/dr-sync-nextcloud/src/provider.rs#L1), [`core/dr-sync/src/account.rs:361`](../core/dr-sync/src/account.rs#L361), [`ui/dr-ui/src/launch.rs:277`](../ui/dr-ui/src/launch.rs#L277), [`ui/dr-ui/src/launch.rs:61`](../ui/dr-ui/src/launch.rs#L61), [`ui/dr-ui/src/launch_ui.rs:417`](../ui/dr-ui/src/launch_ui.rs#L417) |
 | FR-NC-10 | [`core/dr-sync/src/account.rs:226`](../core/dr-sync/src/account.rs#L226), [`ui/dr-ui/src/export.rs:1`](../ui/dr-ui/src/export.rs#L1), [`ui/dr-ui/src/lib.rs:674`](../ui/dr-ui/src/lib.rs#L674), [`ui/dr-ui/src/library.rs:1170`](../ui/dr-ui/src/library.rs#L1170), [`ui/dr-ui/src/library.rs:2483`](../ui/dr-ui/src/library.rs#L2483), [`ui/dr-ui/src/library.rs:589`](../ui/dr-ui/src/library.rs#L589), [`ui/dr-ui/src/library.rs:916`](../ui/dr-ui/src/library.rs#L916), [`ui/dr-ui/src/library_ui.rs:2020`](../ui/dr-ui/src/library_ui.rs#L2020), [`ui/dr-ui/src/library_ui.rs:4205`](../ui/dr-ui/src/library_ui.rs#L4205), [`ui/dr-ui/src/library_ui.rs:618`](../ui/dr-ui/src/library_ui.rs#L618), [`ui/dr-ui/src/sidecar_cache.rs:1`](../ui/dr-ui/src/sidecar_cache.rs#L1) |
-| FR-NC-12 | [`core/dr-sync-folder/src/lib.rs:1`](../core/dr-sync-folder/src/lib.rs#L1), [`core/dr-sync-nextcloud/src/lib.rs:40`](../core/dr-sync-nextcloud/src/lib.rs#L40), [`core/dr-sync-nextcloud/src/lib.rs:914`](../core/dr-sync-nextcloud/src/lib.rs#L914), [`core/dr-sync-nextcloud/src/provider.rs:1`](../core/dr-sync-nextcloud/src/provider.rs#L1), [`core/dr-sync/src/account.rs:1`](../core/dr-sync/src/account.rs#L1), [`core/dr-sync/src/account.rs:87`](../core/dr-sync/src/account.rs#L87), [`core/dr-sync/src/lib.rs:218`](../core/dr-sync/src/lib.rs#L218), [`core/dr-sync/src/lib.rs:51`](../core/dr-sync/src/lib.rs#L51), [`core/dr-sync/src/provider.rs:106`](../core/dr-sync/src/provider.rs#L106), [`core/dr-sync/src/provider.rs:1`](../core/dr-sync/src/provider.rs#L1), [`core/dr-sync/src/provider.rs:53`](../core/dr-sync/src/provider.rs#L53), [`core/dr-sync/src/reachability.rs:1`](../core/dr-sync/src/reachability.rs#L1), [`ui/dr-ui/src/remote.rs:1`](../ui/dr-ui/src/remote.rs#L1) |
+| FR-NC-12 | [`core/dr-sync-folder/src/lib.rs:1`](../core/dr-sync-folder/src/lib.rs#L1), [`core/dr-sync-nextcloud/src/lib.rs:1022`](../core/dr-sync-nextcloud/src/lib.rs#L1022), [`core/dr-sync-nextcloud/src/lib.rs:40`](../core/dr-sync-nextcloud/src/lib.rs#L40), [`core/dr-sync-nextcloud/src/provider.rs:1`](../core/dr-sync-nextcloud/src/provider.rs#L1), [`core/dr-sync/src/account.rs:1`](../core/dr-sync/src/account.rs#L1), [`core/dr-sync/src/account.rs:87`](../core/dr-sync/src/account.rs#L87), [`core/dr-sync/src/lib.rs:218`](../core/dr-sync/src/lib.rs#L218), [`core/dr-sync/src/lib.rs:51`](../core/dr-sync/src/lib.rs#L51), [`core/dr-sync/src/provider.rs:106`](../core/dr-sync/src/provider.rs#L106), [`core/dr-sync/src/provider.rs:1`](../core/dr-sync/src/provider.rs#L1), [`core/dr-sync/src/provider.rs:53`](../core/dr-sync/src/provider.rs#L53), [`core/dr-sync/src/reachability.rs:1`](../core/dr-sync/src/reachability.rs#L1), [`ui/dr-ui/src/remote.rs:1`](../ui/dr-ui/src/remote.rs#L1) |
 | FR-NC-13 | [`core/dr-sync-folder/src/lib.rs:197`](../core/dr-sync-folder/src/lib.rs#L197), [`core/dr-sync-folder/src/lib.rs:1`](../core/dr-sync-folder/src/lib.rs#L1), [`core/dr-sync-folder/src/lib.rs:73`](../core/dr-sync-folder/src/lib.rs#L73), [`core/dr-sync/src/provider.rs:106`](../core/dr-sync/src/provider.rs#L106), [`ui/dr-ui/src/launch_ui.rs:316`](../ui/dr-ui/src/launch_ui.rs#L316), [`ui/dr-ui/src/remote.rs:1`](../ui/dr-ui/src/remote.rs#L1) |
 | FR-NC-2 | [`core/dr-sync/src/account.rs:1`](../core/dr-sync/src/account.rs#L1), [`core/dr-sync/src/account.rs:304`](../core/dr-sync/src/account.rs#L304), [`core/dr-sync/src/account.rs:361`](../core/dr-sync/src/account.rs#L361), [`core/dr-sync/src/account.rs:59`](../core/dr-sync/src/account.rs#L59), [`platform/dr-plat/src/secrets.rs:82`](../platform/dr-plat/src/secrets.rs#L82) |
 | FR-NC-3 | [`core/dr-decode/src/locate.rs:1`](../core/dr-decode/src/locate.rs#L1), [`core/dr-decode/src/preview.rs:148`](../core/dr-decode/src/preview.rs#L148), [`core/dr-sync/src/capability.rs:85`](../core/dr-sync/src/capability.rs#L85), [`core/dr-thumbs/src/lib.rs:1`](../core/dr-thumbs/src/lib.rs#L1), [`core/dr-types/src/place.rs:1`](../core/dr-types/src/place.rs#L1), [`ui/dr-ui/src/library.rs:1`](../ui/dr-ui/src/library.rs#L1), [`ui/dr-ui/src/library.rs:3520`](../ui/dr-ui/src/library.rs#L3520), [`ui/dr-ui/src/library.rs:4278`](../ui/dr-ui/src/library.rs#L4278), [`ui/dr-ui/src/library_ui.rs:1`](../ui/dr-ui/src/library_ui.rs#L1), [`ui/dr-ui/src/library_ui.rs:4463`](../ui/dr-ui/src/library_ui.rs#L4463), [`ui/dr-ui/src/library_ui.rs:5974`](../ui/dr-ui/src/library_ui.rs#L5974), [`ui/dr-ui/ui/app.slint:383`](../ui/dr-ui/ui/app.slint#L383), [`ui/dr-ui/ui/settings.slint:420`](../ui/dr-ui/ui/settings.slint#L420), [`ui/dr-ui/ui/settings.slint:73`](../ui/dr-ui/ui/settings.slint#L73) |
@@ -112,7 +112,7 @@ _None._
 | FR-NC-7a | [`core/dr-ingest/src/layout.rs:1`](../core/dr-ingest/src/layout.rs#L1), [`core/dr-sync/src/upload.rs:1`](../core/dr-sync/src/upload.rs#L1), [`core/dr-sync/src/upload.rs:40`](../core/dr-sync/src/upload.rs#L40), [`core/dr-types/src/settings.rs:309`](../core/dr-types/src/settings.rs#L309), [`ui/dr-ui/src/import.rs:1`](../ui/dr-ui/src/import.rs#L1), [`ui/dr-ui/src/import.rs:97`](../ui/dr-ui/src/import.rs#L97), [`ui/dr-ui/src/import_ui.rs:1`](../ui/dr-ui/src/import_ui.rs#L1), [`ui/dr-ui/src/lib.rs:1508`](../ui/dr-ui/src/lib.rs#L1508), [`ui/dr-ui/ui/import.slint:5`](../ui/dr-ui/ui/import.slint#L5) |
 | FR-NC-7b | [`core/dr-ingest/src/lib.rs:733`](../core/dr-ingest/src/lib.rs#L733), [`core/dr-sync/src/upload.rs:1`](../core/dr-sync/src/upload.rs#L1), [`ui/dr-ui/src/import.rs:122`](../ui/dr-ui/src/import.rs#L122), [`ui/dr-ui/src/import.rs:336`](../ui/dr-ui/src/import.rs#L336), [`ui/dr-ui/src/import.rs:584`](../ui/dr-ui/src/import.rs#L584), [`ui/dr-ui/src/import.rs:97`](../ui/dr-ui/src/import.rs#L97), [`ui/dr-ui/src/import_ui.rs:1`](../ui/dr-ui/src/import_ui.rs#L1), [`ui/dr-ui/src/lib.rs:1508`](../ui/dr-ui/src/lib.rs#L1508) |
 | FR-NC-8 | [`core/dr-catalog/src/rating.rs:204`](../core/dr-catalog/src/rating.rs#L204), [`core/dr-catalog/src/rating.rs:66`](../core/dr-catalog/src/rating.rs#L66), [`core/dr-catalog/src/rating.rs:929`](../core/dr-catalog/src/rating.rs#L929), [`core/dr-catalog/src/schema.rs:179`](../core/dr-catalog/src/schema.rs#L179), [`core/dr-pipeline/src/sidecar.rs:122`](../core/dr-pipeline/src/sidecar.rs#L122), [`core/dr-pipeline/src/sidecar.rs:2944`](../core/dr-pipeline/src/sidecar.rs#L2944), [`core/dr-pipeline/src/sidecar.rs:645`](../core/dr-pipeline/src/sidecar.rs#L645), [`core/dr-pipeline/src/sidecar.rs:720`](../core/dr-pipeline/src/sidecar.rs#L720), [`core/dr-pipeline/src/sidecar.rs:96`](../core/dr-pipeline/src/sidecar.rs#L96), [`ui/dr-ui/src/lib.rs:2374`](../ui/dr-ui/src/lib.rs#L2374), [`ui/dr-ui/src/library.rs:1062`](../ui/dr-ui/src/library.rs#L1062), [`ui/dr-ui/src/library.rs:2538`](../ui/dr-ui/src/library.rs#L2538), [`ui/dr-ui/src/library.rs:500`](../ui/dr-ui/src/library.rs#L500), [`ui/dr-ui/src/library.rs:760`](../ui/dr-ui/src/library.rs#L760), [`ui/dr-ui/src/library.rs:7751`](../ui/dr-ui/src/library.rs#L7751), [`ui/dr-ui/src/library_ui.rs:586`](../ui/dr-ui/src/library_ui.rs#L586), [`ui/dr-ui/src/presets.rs:288`](../ui/dr-ui/src/presets.rs#L288), [`ui/dr-ui/src/presets.rs:336`](../ui/dr-ui/src/presets.rs#L336) |
-| FR-NC-9 | [`core/dr-catalog/src/merge.rs:1`](../core/dr-catalog/src/merge.rs#L1), [`core/dr-catalog/src/rating.rs:204`](../core/dr-catalog/src/rating.rs#L204), [`core/dr-catalog/src/rating.rs:66`](../core/dr-catalog/src/rating.rs#L66), [`core/dr-catalog/src/rating.rs:929`](../core/dr-catalog/src/rating.rs#L929), [`core/dr-catalog/src/schema.rs:179`](../core/dr-catalog/src/schema.rs#L179), [`core/dr-catalog/src/schema.rs:557`](../core/dr-catalog/src/schema.rs#L557), [`core/dr-catalog/src/schema.rs:838`](../core/dr-catalog/src/schema.rs#L838), [`core/dr-catalog/src/sync.rs:1`](../core/dr-catalog/src/sync.rs#L1), [`core/dr-pipeline/src/sidecar.rs:177`](../core/dr-pipeline/src/sidecar.rs#L177), [`core/dr-pipeline/src/sidecar.rs:204`](../core/dr-pipeline/src/sidecar.rs#L204), [`core/dr-pipeline/src/sidecar.rs:2473`](../core/dr-pipeline/src/sidecar.rs#L2473), [`core/dr-pipeline/src/sidecar.rs:2710`](../core/dr-pipeline/src/sidecar.rs#L2710), [`core/dr-pipeline/src/sidecar.rs:2944`](../core/dr-pipeline/src/sidecar.rs#L2944), [`core/dr-pipeline/src/sidecar.rs:380`](../core/dr-pipeline/src/sidecar.rs#L380), [`core/dr-pipeline/src/sidecar.rs:478`](../core/dr-pipeline/src/sidecar.rs#L478), [`core/dr-pipeline/src/sidecar.rs:645`](../core/dr-pipeline/src/sidecar.rs#L645), [`core/dr-pipeline/src/sidecar.rs:695`](../core/dr-pipeline/src/sidecar.rs#L695), [`core/dr-pipeline/src/sidecar.rs:720`](../core/dr-pipeline/src/sidecar.rs#L720), [`core/dr-pipeline/src/spot.rs:245`](../core/dr-pipeline/src/spot.rs#L245), [`core/dr-pipeline/tests/mask_sidecar.rs:1075`](../core/dr-pipeline/tests/mask_sidecar.rs#L1075), [`core/dr-pipeline/tests/spot_sidecar.rs:1`](../core/dr-pipeline/tests/spot_sidecar.rs#L1), [`core/dr-sync/src/scan.rs:31`](../core/dr-sync/src/scan.rs#L31), [`core/dr-sync/src/scan.rs:56`](../core/dr-sync/src/scan.rs#L56), [`core/dr-sync/src/scan.rs:926`](../core/dr-sync/src/scan.rs#L926), [`core/dr-xmp/src/lib.rs:733`](../core/dr-xmp/src/lib.rs#L733), [`core/dr-xmp/src/lib.rs:746`](../core/dr-xmp/src/lib.rs#L746), [`ui/dr-ui/src/derived_sync.rs:614`](../ui/dr-ui/src/derived_sync.rs#L614), [`ui/dr-ui/src/derived_sync.rs:647`](../ui/dr-ui/src/derived_sync.rs#L647), [`ui/dr-ui/src/derived_sync.rs:878`](../ui/dr-ui/src/derived_sync.rs#L878), [`ui/dr-ui/src/library.rs:1062`](../ui/dr-ui/src/library.rs#L1062), [`ui/dr-ui/src/library.rs:1082`](../ui/dr-ui/src/library.rs#L1082), [`ui/dr-ui/src/library.rs:1391`](../ui/dr-ui/src/library.rs#L1391), [`ui/dr-ui/src/library.rs:1426`](../ui/dr-ui/src/library.rs#L1426), [`ui/dr-ui/src/library.rs:2538`](../ui/dr-ui/src/library.rs#L2538), [`ui/dr-ui/src/library.rs:73`](../ui/dr-ui/src/library.rs#L73), [`ui/dr-ui/src/library.rs:7583`](../ui/dr-ui/src/library.rs#L7583), [`ui/dr-ui/src/library.rs:760`](../ui/dr-ui/src/library.rs#L760), [`ui/dr-ui/src/library.rs:7751`](../ui/dr-ui/src/library.rs#L7751), [`ui/dr-ui/src/library.rs:832`](../ui/dr-ui/src/library.rs#L832), [`ui/dr-ui/src/library.rs:916`](../ui/dr-ui/src/library.rs#L916), [`ui/dr-ui/src/library_ui.rs:1302`](../ui/dr-ui/src/library_ui.rs#L1302), [`ui/dr-ui/src/presets.rs:288`](../ui/dr-ui/src/presets.rs#L288), [`ui/dr-ui/src/presets.rs:336`](../ui/dr-ui/src/presets.rs#L336), [`ui/dr-ui/src/xmp_sync.rs:1`](../ui/dr-ui/src/xmp_sync.rs#L1), [`ui/dr-ui/src/xmp_sync.rs:287`](../ui/dr-ui/src/xmp_sync.rs#L287) |
+| FR-NC-9 | [`core/dr-catalog/src/merge.rs:1`](../core/dr-catalog/src/merge.rs#L1), [`core/dr-catalog/src/rating.rs:204`](../core/dr-catalog/src/rating.rs#L204), [`core/dr-catalog/src/rating.rs:66`](../core/dr-catalog/src/rating.rs#L66), [`core/dr-catalog/src/rating.rs:929`](../core/dr-catalog/src/rating.rs#L929), [`core/dr-catalog/src/schema.rs:179`](../core/dr-catalog/src/schema.rs#L179), [`core/dr-catalog/src/schema.rs:557`](../core/dr-catalog/src/schema.rs#L557), [`core/dr-catalog/src/schema.rs:838`](../core/dr-catalog/src/schema.rs#L838), [`core/dr-catalog/src/sync.rs:1`](../core/dr-catalog/src/sync.rs#L1), [`core/dr-pipeline/src/sidecar.rs:177`](../core/dr-pipeline/src/sidecar.rs#L177), [`core/dr-pipeline/src/sidecar.rs:204`](../core/dr-pipeline/src/sidecar.rs#L204), [`core/dr-pipeline/src/sidecar.rs:2473`](../core/dr-pipeline/src/sidecar.rs#L2473), [`core/dr-pipeline/src/sidecar.rs:2710`](../core/dr-pipeline/src/sidecar.rs#L2710), [`core/dr-pipeline/src/sidecar.rs:2944`](../core/dr-pipeline/src/sidecar.rs#L2944), [`core/dr-pipeline/src/sidecar.rs:380`](../core/dr-pipeline/src/sidecar.rs#L380), [`core/dr-pipeline/src/sidecar.rs:478`](../core/dr-pipeline/src/sidecar.rs#L478), [`core/dr-pipeline/src/sidecar.rs:645`](../core/dr-pipeline/src/sidecar.rs#L645), [`core/dr-pipeline/src/sidecar.rs:695`](../core/dr-pipeline/src/sidecar.rs#L695), [`core/dr-pipeline/src/sidecar.rs:720`](../core/dr-pipeline/src/sidecar.rs#L720), [`core/dr-pipeline/src/spot.rs:245`](../core/dr-pipeline/src/spot.rs#L245), [`core/dr-pipeline/tests/mask_sidecar.rs:1075`](../core/dr-pipeline/tests/mask_sidecar.rs#L1075), [`core/dr-pipeline/tests/spot_sidecar.rs:1`](../core/dr-pipeline/tests/spot_sidecar.rs#L1), [`core/dr-sync-nextcloud/src/lib.rs:124`](../core/dr-sync-nextcloud/src/lib.rs#L124), [`core/dr-sync/src/scan.rs:31`](../core/dr-sync/src/scan.rs#L31), [`core/dr-sync/src/scan.rs:56`](../core/dr-sync/src/scan.rs#L56), [`core/dr-sync/src/scan.rs:926`](../core/dr-sync/src/scan.rs#L926), [`core/dr-xmp/src/lib.rs:733`](../core/dr-xmp/src/lib.rs#L733), [`core/dr-xmp/src/lib.rs:746`](../core/dr-xmp/src/lib.rs#L746), [`ui/dr-ui/src/derived_sync.rs:614`](../ui/dr-ui/src/derived_sync.rs#L614), [`ui/dr-ui/src/derived_sync.rs:647`](../ui/dr-ui/src/derived_sync.rs#L647), [`ui/dr-ui/src/derived_sync.rs:878`](../ui/dr-ui/src/derived_sync.rs#L878), [`ui/dr-ui/src/library.rs:1062`](../ui/dr-ui/src/library.rs#L1062), [`ui/dr-ui/src/library.rs:1082`](../ui/dr-ui/src/library.rs#L1082), [`ui/dr-ui/src/library.rs:1391`](../ui/dr-ui/src/library.rs#L1391), [`ui/dr-ui/src/library.rs:1426`](../ui/dr-ui/src/library.rs#L1426), [`ui/dr-ui/src/library.rs:2538`](../ui/dr-ui/src/library.rs#L2538), [`ui/dr-ui/src/library.rs:73`](../ui/dr-ui/src/library.rs#L73), [`ui/dr-ui/src/library.rs:7583`](../ui/dr-ui/src/library.rs#L7583), [`ui/dr-ui/src/library.rs:760`](../ui/dr-ui/src/library.rs#L760), [`ui/dr-ui/src/library.rs:7751`](../ui/dr-ui/src/library.rs#L7751), [`ui/dr-ui/src/library.rs:832`](../ui/dr-ui/src/library.rs#L832), [`ui/dr-ui/src/library.rs:916`](../ui/dr-ui/src/library.rs#L916), [`ui/dr-ui/src/library_ui.rs:1302`](../ui/dr-ui/src/library_ui.rs#L1302), [`ui/dr-ui/src/presets.rs:288`](../ui/dr-ui/src/presets.rs#L288), [`ui/dr-ui/src/presets.rs:336`](../ui/dr-ui/src/presets.rs#L336), [`ui/dr-ui/src/xmp_sync.rs:1`](../ui/dr-ui/src/xmp_sync.rs#L1), [`ui/dr-ui/src/xmp_sync.rs:287`](../ui/dr-ui/src/xmp_sync.rs#L287) |
 | FR-PLAT-AND-2 | [`core/dr-catalog/src/walk.rs:1022`](../core/dr-catalog/src/walk.rs#L1022), [`core/dr-catalog/src/walk.rs:435`](../core/dr-catalog/src/walk.rs#L435), [`core/dr-sync-folder/src/lib.rs:242`](../core/dr-sync-folder/src/lib.rs#L242), [`core/dr-sync-folder/src/tests.rs:51`](../core/dr-sync-folder/src/tests.rs#L51), [`core/dr-sync/src/error.rs:113`](../core/dr-sync/src/error.rs#L113), [`core/dr-sync/src/error.rs:195`](../core/dr-sync/src/error.rs#L195), [`core/dr-sync/src/scan.rs:211`](../core/dr-sync/src/scan.rs#L211), [`core/dr-sync/src/scan.rs:519`](../core/dr-sync/src/scan.rs#L519), [`core/dr-sync/src/scan.rs:545`](../core/dr-sync/src/scan.rs#L545), [`core/dr-sync/src/scan.rs:574`](../core/dr-sync/src/scan.rs#L574), [`ui/dr-ui/src/library.rs:1291`](../ui/dr-ui/src/library.rs#L1291), [`ui/dr-ui/src/library.rs:1344`](../ui/dr-ui/src/library.rs#L1344), [`ui/dr-ui/src/library.rs:1375`](../ui/dr-ui/src/library.rs#L1375), [`ui/dr-ui/src/library.rs:1955`](../ui/dr-ui/src/library.rs#L1955), [`ui/dr-ui/src/library_ui.rs:1273`](../ui/dr-ui/src/library_ui.rs#L1273), [`ui/dr-ui/src/library_ui.rs:1369`](../ui/dr-ui/src/library_ui.rs#L1369), [`ui/dr-ui/src/library_ui.rs:1968`](../ui/dr-ui/src/library_ui.rs#L1968), [`ui/dr-ui/src/library_ui.rs:328`](../ui/dr-ui/src/library_ui.rs#L328), [`ui/dr-ui/src/library_ui.rs:555`](../ui/dr-ui/src/library_ui.rs#L555) |
 | FR-PLAT-AND-3 | [`core/dr-catalog/src/jobs.rs:1`](../core/dr-catalog/src/jobs.rs#L1), [`core/dr-catalog/src/runner.rs:1`](../core/dr-catalog/src/runner.rs#L1) |
 | FR-PLAT-AND-4 | [`core/dr-catalog/src/runner.rs:1`](../core/dr-catalog/src/runner.rs#L1) |