Thought I'd experienced all the technical difficulties possible at this ATM, but I decided to risk it again today and faced yet another one, so had to minus one more star.
This time, there were no deposit envelopes at the outside kiosk. There was a single business envelope in the plastic bin, which seemed unrelated to the usual deposit transaction, so I wasn't about to insert a mystery envelope in the machine with my funds lest it be tossed in the trash in error at the processing center.