“In your ID3 tags, it’s important that the Album Artist (even if it’s blank) and Album title are identical in each file. If Album Artist is blank, the album will still be listed under the Artist’s name if the Artist tags are identical for all tracks. If they are not identical, the album will be listed under “Various Artists.””
For more, have a look over here: [HowTo] Configure Plex to use embedded metadata (music)
