Yes, the thumbnail needs to be rebuilt, but none of the "Cover Art" commands seem to work on the client side, i.e. "Rebuild Thumbnail" or "Quick Find in File / Cover Art Directory." I can get it to update if I update the files by using the host MC via the web VNC, but that is such a laggy process that I am hoping that I can somehow do that via the client MC. I'm not adding or changing the file structure from the client; I just want the client to tell the host to scan the directory for cover art changes.
We've added this to the most recent build. Thanks for the suggestion!
If the image is in the file tag only you can simply do "Rebuild Thumbnail" on the client.
If it's in a Folder.jpg, the "Quick Find ..." on the client will do the job.
You'll need an updated client and server MC.
At least version 29.0.50 for linux or Mac.
At least version 29.0.51 for Windows (when it's generally available).