If itunes finds the artwork for you, it never adds it to your MP3 files, so you have to Get Info and copy and past it. If you have art yourself, then you have to copy and paste them in. A little strange.
Pushing Album art to MP3 files – Mac Forums
n my experience they only [...]
itunes inconsistent in how it handles artwork
September 6th, 2008 · No Comments · Geek
Tags: Control·Control C·Copy Image·Google·Google Image Search·Id Tag·Itunes·Mac Forums·Mp3 Files·Paste Command·Picture Browser·Pixel·Strange·Unnecessary Step·Wikipedia