After clicking 'Create and Copy Download Link' I'd wonder if the file had uploaded, for example if I were uploading an image or video to share on hn or reddit or whatever I'd want to make sure it's there before providing the link to others. So I guess I'd open the link in a browser to make sure. Even so, I still this this saves time where you're confident the file's small enough that it would upload in the time it takes you to send the link (likely, in a lot of cases) or you don't mind that it might take a little time.
Anyway, I like this idea. Nice work.