fix: encrypted files

lib/utils/matrix_sdk_extensions.dart/event_extension.dart

@@ -87,9 +87,9 @@ extension LocalizedBody on Event {
 
   Future<MatrixFile> downloadAndDecryptAttachmentCached(
       {bool getThumbnail = false}) async {
-    final mxcUrl = attachmentOrThumbnailMxcUrl(getThumbnail: getThumbnail);
-    _downloadAndDecryptFutures[mxcUrl.toString()] ??=
-        downloadAndDecryptAttachment(
+    final mxcUrl =
+        attachmentOrThumbnailMxcUrl(getThumbnail: getThumbnail).toString();
+    _downloadAndDecryptFutures[mxcUrl] ??= downloadAndDecryptAttachment(
       getThumbnail: getThumbnail,
       downloadCallback: (Uri url) async {
         final file = await DefaultCacheManager().getSingleFile(url.toString());

lib/widgets/event_content/audio_player.dart

@@ -76,7 +76,7 @@ class _AudioPlayerState extends State<AudioPlayerWidget> {
       Logs().v('Could not download audio file', e, s);
       ScaffoldMessenger.of(context).showSnackBar(
         SnackBar(
-          content: Text(e.toLocalizedString(context)),
+          content: Text(e.toString()),
         ),
       );
     }

lib/widgets/event_content/image_bubble.dart

@@ -261,12 +261,11 @@ class _ImageBubbleState extends State<ImageBubble> {
         widget.event.attachmentOrThumbnailMxcUrl(getThumbnail: true) ==
             widget.event.attachmentMxcUrl;
     final key = isOriginal
-        ? widget.event.attachmentMxcUrl
-        : widget.event.thumbnailMxcUrl;
+        ? widget.event.attachmentMxcUrl.toString()
+        : widget.event.thumbnailMxcUrl.toString();
     final mimetype = getMimetype(!isOriginal);
     if (_contentRenderers.containsKey(mimetype)) {
-      return _contentRenderers[mimetype]
-          .memory(_displayFile.bytes, key.toString());
+      return _contentRenderers[mimetype].memory(_displayFile.bytes, key);
     } else {
       return Image.memory(
         _displayFile.bytes,