missing album art

is there a good method to do this?
I have tried numerous apps and they all fall short in some way.
Seems some fixes are recognized by Google Play Music and others not.

Album Art Grabber
ID3 Fixer
Star Music Tag Fixer
Music Tag Fixer
Cover Art Grabber
Album Art Changer

Or is the only choice uploading to G, fix from there, then sync to the phone?