I have found that compilations and special deditions often require extra care when tagging the files.
You will have to tell Plex to favour your embedded meta tags, instead of data from last.fm or Gracenote.
You do it this way:
Settings - Server - Agents - Albums - last.fm
drag the line ‘Local Media Assets’ into the top position of the list
repeat the same under Settings - Server - Agents - Albums - Plex Premium Music
Edit your music library, go to the ‘Advanced’ tab and put a checkmark into ‘Use embedded meta tags’
‘Album Title’ must be identical in all tracks on all discs of this album. The disc number does not belong into here. ‘Titled discs’ are not possible.
‘Album Artist’ must be identical in all tracks on all discs of this album. (This is not the ‘Track artist’ which can be different for every track)
‘Disc number’ must be existent and contain only a simple number (Don’t try 1/6 or similar)
After checking the above, perform the Plex Dance with the album.
(With music, you can omit step 4 of the dance)
