[mob] Fix: Enable video upload without thumbnail for shared files (#3506)

## Description

## Tests

mobile/lib/services/machine_learning/ml_service.dart

@@ -133,7 +133,7 @@ class MLService {
       }
       if (_mlControllerStatus == true) {
         // refresh discover section
-        MagicCacheService.instance.updateCache().ignore();
+        MagicCacheService.instance.updateCache(forced: force).ignore();
       }
       await indexAllImages();
       if ((await MLDataDB.instance.getUnclusteredFaceCount()) > 0) {

mobile/lib/services/magic_cache_service.dart

@@ -205,7 +205,7 @@ class MagicCacheService {
       queueUpdate("Prompts data updated");
     } else if (lastMagicCacheUpdateTime <
         DateTime.now()
-            .subtract(const Duration(days: 1))
+            .subtract(const Duration(hours: 12))
             .millisecondsSinceEpoch) {
       queueUpdate("Cache is old");
     }

mobile/lib/utils/file_uploader_util.dart

@@ -342,7 +342,8 @@ Future<MediaUploadData> _getMediaUploadDataFromAppCache(EnteFile file) async {
     Map<String, int>? dimensions;
     if (file.fileType == FileType.image) {
       dimensions = await getImageHeightAndWith(imagePath: localPath);
-    } else {
+    } else if (thumbnailData != null) {
+      // the thumbnail null check is to ensure that we are able to generate thum
       // for video, we need to use the thumbnail data with any max width/height
       final thumbnailFilePath = await VideoThumbnail.thumbnailFile(
         video: localPath,
@@ -406,14 +407,19 @@ Future<Uint8List?> getThumbnailFromInAppCacheFile(EnteFile file) async {
     return null;
   }
   if (file.fileType == FileType.video) {
-    final thumbnailFilePath = await VideoThumbnail.thumbnailFile(
-      video: localFile.path,
-      imageFormat: ImageFormat.JPEG,
-      thumbnailPath: (await getTemporaryDirectory()).path,
-      maxWidth: thumbnailLargeSize,
-      quality: 80,
-    );
-    localFile = File(thumbnailFilePath!);
+    try {
+      final thumbnailFilePath = await VideoThumbnail.thumbnailFile(
+        video: localFile.path,
+        imageFormat: ImageFormat.JPEG,
+        thumbnailPath: (await getTemporaryDirectory()).path,
+        maxWidth: thumbnailLargeSize,
+        quality: 80,
+      );
+      localFile = File(thumbnailFilePath!);
+    } catch (e) {
+      _logger.warning('Failed to generate video thumbnail', e);
+      return null;
+    }
   }
   var thumbnailData = await localFile.readAsBytes();
   int compressionAttempts = 0;