Sorry but I’m not a sure I can help since I don’t sidecar album art, I’m not sure what it means.
If the album art isn’t saved as metadata, the easiest way to add it is to manually add the file from your computer with choose an image, or use a link from the web under “enter a url”.
I have it as metadata and saved as cover art in the folder as a jpg. Plex shows a third one. No idea why.
If you’re flat out getting a jumbled match, then I find it best to delete the folder, do the plex dance and then reload the folder for the album after a metadata check and hold thumbs it works.
