Having trouble getting Plex to show album cover art

The albums inherit the artist art. The artist art was not looked up–obscure artist, remember–so I added an artist jpg to Plex myself. Now all that artist’s albums get that art instead of no art.

Except one album, which DOES for some reason display the correct album art, even though it isn’t matched either. It must have gotten it from the tag or cover.jpg.

I’m gonna Plex Dance again and start from scratch, this time without adding Artist art manually.

Edit: Did Plex Dance. On re-adding the artist I found that I COULD match the artist. However all the albums save one still inherited the artist image instead of using local assets. Weird. I gave up and just dragged and dropped the cover files but if there’s something else to try I will check it out.