Automatically scan and remove 'unavailable' files not working?

Thanks for the logs.

From your logs:

Feb 19, 2026 19:02:44.166 [1109402480] ERROR - [Req#a0ba] [Notify] Failed to add watch for "/volume1/music/Pet Shop Boys" (28: No space left on device)
Feb 19, 2026 19:02:44.186 [1109402480] ERROR - [Req#a0ba] [Notify] Failed to add watch for "/volume1/music/Pet Shop Boys/Pandemonium" (28: No space left on device)
Feb 19, 2026 19:02:44.203 [1109402480] ERROR - [Req#a0ba] [Notify] Failed to add watch for "/volume1/music/Pet Shop Boys/Tracks" (28: No space left on device)
Feb 19, 2026 19:02:44.220 [1109402480] ERROR - [Req#a0ba] [Notify] Failed to add watch for "/volume1/music/Pet Shop Boys/Please _ Further Listening 1984–1986" (28: No space left on device)
Feb 19, 2026 19:02:44.230 [1109402480] ERROR - [Req#a0ba] [Notify] Failed to add watch for "/volume1/music/Pet Shop Boys/Format_ B‐sides and Bonus Tracks (1996–2009)" (28: No space left on device)

These errors indicate a problem with your iNotify table. You have too may folders for Synology/Plex to monitor.

Read through this article and correct your iNotify table.

Note: I see a lot of other issues as well, but we will deal with those after you have taken care of the issue above.