There is a problem where external subtitles files downloaded with Bazarr are not automatically scanned and added to the library by Plex. The movie metadata must be refreshed manually for the subtitles files to be scanned and selectable in the player.
Is this the intended behavior, or is there a setting that I have missed?
Then check these two:
Edit your library and enable use local assets in advanced tab.
Go to settings> agents find your agent there and enable local assets and move it to the top of the list
If that also doesn’t work make sure you’re using the new agent and not the legacy one