Please stop and restart the server again.
Then perform the Plex Dance with the movie.
Does the library use TheMoviedatabase agent as its default? It should.
Have you checked the access permissions of the file? plex/plex needs to have at least ‘read’ permission.
Are you ripping/downloading directly into this folder?
I’ll need both Plex Media Server.log and Plex Media Scanner.log after the “dance”.