Upload is stuck in status "Pending: process_upload"

Currently, there seems to be no option to cancel an upload during processing. Trying to delete a pending upload results in the error: "Unexpected error: "The upload is still being processed.". Please try again and let us know, if this error keeps happening.".

I have several instances of uploads hanging indefinitely, e.g., upload ids: -NGoTYl-QYGg1W4ze0HcXA, Yvvzqxc0Q-6HfXTTMYWHog. Not sure what the issue is in these cases, but it seems to happen to me occasionally with MD data when the processing time is relatively long.

Do we want to give the user the option to delete and try again? Or is this something that they should always have to contact someone about?