In general, I would refer you to this How-To:
[HowTo] Configure Plex to use embedded metadata (music)
A couple questions:
- What do you use to edit the embedded metadata in your music files?
- Are your files on an internal hard drive in your Mac, or an external drive, like an NAS or external USB drive?
You can also look back through your history on the forums to see if the advice you received in the past is relevant:
https://forums.plex.tv/u/najsinger/activity/topics
