Works, but has some bugs:
If you press Esc to cancel a capture, that should be the end of it.
Not so with this app.
After pressing Esc, the "Save to" window appears.
Then you must press the Discard button and you’re asked to confirm.
But when you press OK, you’re told it’s "unable to delete" because "the file doesn’t exist"
Of course it doesn’t exist, it was CANCELLED!