"Remove file" is a "known issue".

Your criticism is valid (thanks). I'm not sure I understand what you mean by "no obvious way to exit the form" though. Since there are progress bars and checkmarks, what else would you suggest to indicate that uploading is done? There's also a counter at the navbar.

What you described in the last paragraph is our current focus. It's not easy but we think it would be very useful.

What do you think about OMR (Optical Music Recognition)? Would you find it useful in any way? For example a use case would be to snap a picture of a score and have it played back.