Are you able to submit scans/pictures of receipts? There's tons of apps/plus just the camera app that you can use to snap a quick pic and then throw away.
honestly, I might have to try this, though my wife uses something similar for work, and she hates it because at their company, if anything isn't scanned, then she has to "make up" stuff and take a picture of it, like write on a piece of paper, cash tip to bellman for bags, date, location, and time.