Yet another thing I thought I'd created a ticket for already, but don't seem to have...

Right now we have four different pages for editing cover art: add, edit, remove and reorder. I think they could be combined into a single interface which lets you do all four.

See the attached screenshot for a mockup of how I think it could work. That's based on the current add cover art page and shows all images (i.e. existing ones and those to be uploaded) and indicates the status via the background colour in the same way the relationship editor does (white is no changes, green is a new image, yellow is being edited, red is being removed). It could probably look a bit less garish, but hopefully the idea makes sense.

As well as reducing the number of pages for editing, it would make it possible to do things like edit and remove multiple images at once, add and remove (e.g. when replacing an image) at the same time and add images interleaved with existing images.