I imported a Handbraked Quicktime movie into iTunes, and wanted to add a cover image. However, the options for 'add or delete album art' in the info window are grayed out, and copying/pasting and dragging the art to the window doesn't work either. I already tried the 'Add artwork' function, and it didn't come up with anything. Anyone have any idea on why this might be, and what to do about it? The artwork options for the iTunes store movies I have work fine - it's only my own Handbrake imports that don't work.