[CP Staging] Fix broken Android upload thumbnail by adding file:// scheme to cached local source

src/libs/actions/Attachment/index.native.ts

@@ -88,7 +88,11 @@ async function getCachedAttachment({attachmentID, attachment, currentSource}: Ge
         // exists. If it was purged, fall back to the current source and re-cache it.
         const localFileExists = await RNFS.exists(localSource);
         if (localFileExists) {
-            return localSource;
+            // The path is stored without a scheme so RNFS file operations (exists/unlink) accept it, but
+            // React Native's <Image> on Android only loads a local file when it carries a `file://`
+            // scheme (a bare path renders as a broken thumbnail), so add the scheme before the path
+            // reaches the image renderer.
+            return localSource.startsWith('file://') ? localSource : `file://${localSource}`;
         }
         cacheAttachment({attachmentID, uri: currentSource});
     }

tests/actions/AttachmentTest.ts

@@ -124,6 +124,20 @@ describe('AttachmentStorage', () => {
         // Then the dead local path is not returned
         expect(resolvedSource).toBe(sourceURL);
     });
+    it('should return the cached local source with a file:// scheme so the native Image can load it', async () => {
+        // Given a cached attachment whose stored file path (no scheme) still exists on disk
+        const attachmentID = 'cached-attachment';
+        const sourceURL = 'https://images.unsplash.com/photo-1726066012751-2adfb5485977?w=500';
+        const localSource = `/mock/caches/attachments/${attachmentID}.jpg`;
+        const attachment = {attachmentID, source: localSource, remoteSource: sourceURL};
+        mockRNFS.exists.mockResolvedValueOnce(true);
+
+        // When reading it from the cache
+        const resolvedSource = await getCachedAttachment({attachmentID, attachment, currentSource: sourceURL});
+
+        // Then the path is returned prefixed with file:// (Android's <Image> can't load a local path without a scheme)
+        expect(resolvedSource).toBe(`file://${localSource}`);
+    });
     it('should cache markdown attachment', async () => {
         // Given the attachment data consisting of sourceURL and markdown comment text
         const sourceURL = 'https://images.unsplash.com/photo-1726066012751-2adfb5485977?w=500';