What is the new bills option on ATMs here?

Saw this at 2 different banks here for the first time, the "bills" option. One ATM had a $50 by that option next to a place you enter a number in the box. The other had $100 next to the empty data entry box. I ended up getting only 200P and was charged a fee that was almost half that. Wanted several mil pesos. I don't know how to work these, never saw them before trying to get money downtown. Ended up having to go to a bank with a high rate because I could not figure out the new ATM option.

Yes I know to decline the conversion option but the bills option, haven't a clue. The answer very well may be "go to an ATM without the bills option".