Sadly, I didn't find anything telling me how to know how many papers are left in my sprocket printer. I just think the printer isn't made to do that. I thought I would be able to know on the app, but I don't see anything regarding to that subject. It makes me mad... such an easy thing they could have done.
You don't know. The easy way is this: open the top of the printer, turn it over and see how many sheets are left. The put them back in (correct way) and close the lid. There is no counter in the app that I know of. But it's not a big deal. OR, print until nothing happens, then open it. If empty put in new paper. Hope that helps.