Images can be dropped anywhere on a request's card, one at a time or many at once, including onto a request that's already waiting for review. The page no longer reloads after the first one; it waits until the drops stop.
A drop that lands while an upload is still running is queued instead of making the browser open the image. A repeated image no longer stops the others in the same drop.
A drop that doesn't contain an image file (such as a link) now says so instead of doing nothing.