This behavior has been broken in Plex for quite a while and the current behavior is really annoying.
What happens?
- add new album to music library
adjust covers so that one has the tag "front cover" while other images have "other". Kodi e.g. then understands which image to use as album cover. Plex does not.
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Plex, for whatever obscure reason, which needs to be investiaged and fixed, selects seemingly randomly any of the images (often times not the one tagged as front cover) and uses that as album art.
This is super-annoying. Please fix this beahvior / bug. It has been going on for a long time and it makes no sense at all.
I would be very happy if a plex dev could elaborate what's going on here. It seems this has been discussed in a few other threads and all users dealing with music seem to be highly frustrated by the current behavior so "Houston, we have a problem".
Brief search turned up (didn't bother to spend more time searching for all related threads)
* https://forums.plex.tv/discussion/177170/force-pms-to-use-album-covers-for-artwork
* http://forums.plex.tv/discussion/169664/music-album-art-embedded-in-file-yet-still-getting-artist-art-instead