Not sure. I enabled collections on two of my libraries and it just worked.
Some things to try:
- Follow Plex naming convention: movie_name (year).ext (Ex: Mission Impossible (1996).mkv)
If you do rename the files, be sure and perform the Plex Dance.
- Check Agents
In Settings -> Agents -> Movies -> Plex Movie, make sure Plex Movie is checked.
Click on the gear icon for Plex Movie and make sure “Use collection info from The Movie Database” is checked.
In Settings -> Agents -> Movis -> The Movie Database, make sure The Movie Database is checked.
Click on the gear icon for TMDB, and make sure “Use collection info…” is checked.
- Rescan the library. Sometimes it takes a second scan to pick up the collections.
That’s everything I can think of for now.
