Artwork missing / buggy & cant just "Get Album Artwork"?

Just switched from iTunes to Apple Devices, Apple TV and Apple Music on my PC. Half of my music library is either missing artwork or its bugged and the artwork isn't showing. On the handful of bugged ones, if I right click and select Properties it'll show up in the little window but it won't show up anywhere else that it tries to load and I'm not sure why. The rest are just entirely missing. I also cant just right click and press "Get Album Artwork" for the items missing artwork like in iTunes. It still exists on the Mac version afaik which is... baffling. How do I fix both of these?