Version 3.14 folder picture isn't saved

Thank you for your feedback!

You say:
With the official "stable" Mp3tag v3.14 it doesn't save cover art from Tag Source, but with the newest beta v3.14k it works fine with the same album and the same mapped network drive Y?

Maybe it is related to the fix in v3.14a:

  • FIX: saving cover to local file did not work anymore when importing from Tag Sources (since 3.12c). (#56823, #56924)