That's another issue easily solved by DnD API modern browsers implement. And should probably be done differently with regards to UX depending on whether the cli

That's another issue easily solved by DnD API modern browsers implement. And should probably be done differently with regards to UX depending on whether the clicky part was a button, or a larger upload area. Frankly, I don't find the original UX of dragging files onto an upload button all that intuitive. So instead I add drop functionality to a larger container in my apps. So if I have dialog that accepts files, users can drag files anywhere over the dialog and the dialog highlights that it accepts drops while dragging.