[help] Adding iTunes Album Art

I've been having this problem for awhile, even with fresh installs and updates. I have no plug-ins installed or anything.

But I simply cannot add artwork to any of my music directly through iTunes. When I try to drag and drop a file, I get the cursor with the "unavailabe" symbol. When I try to copy and paste, it doesn't work. When I try to browse for the artwork and add it that way, it also doesn't work.

What's going on???

#251961

Did you select the songs you want to add artwork too?

#252100