Android downloads fail with 404 because the Emby sync file is missing

[OUARZA 5]

Hello,

I’m having recurring problems downloading TV episodes for offline viewing. Some items stay on “Ready to transfer” or fail. This happens on two Android phones.

Setup

• Emby Server 4.10.0.40 on a Synology DS720+
• Emby for Android 3.5.55 on Android 17

In the latest server log, repeated requests to /emby/Sync/JobItems/277/File fail with DirectoryNotFoundException. Emby says the temporary file under /var/packages/EmbyServer/var/sync/91/277/ does not exist, and returns HTTP 404.

Some FFmpeg and ffprobe operations in the log exit with code 0, but the Android download still fails when it requests the sync file.

The log also contained an earlier Permission denied error when Emby tried to copy a converted file into my media share. I have since granted the internal emby user read/write access to the Download shared folder, but the Android download problem persists.

Could this missing temporary sync file be a known issue with Emby Server or the Android app? What logs would help diagnose it further? I purchased the Android app and would appreciate your help.

Thank you.