Here is a tutorial to add album artwork in iTunes on Windows 11/10. In case you can't add artwork to songs in iTunes, use these fixes.

When users add song files to iTunes, they can import them either by using the "Import" option in the "File Menu", or by dragging the files into the iTunes window.

Enqueue is a full-fledged music playback application, similar in look and feel to iTunes. In fact, it can read and play the contents of your iTunes library as well--in addition to FLAC, Enqueue ...

One installation is complete, all you have to do is restart iTunes, drag FLAC files to the Fluke icon, and they'll be added to your library for your listening pleasure.