What you need to do is: 1. Press the "See Inside" button. /\ 2.Click on the sprite "load sprite". 3. Draw your own | custom drawing (use the color black only) and then grab | a friend, and go into fullscreen and press the grey button | with the other person in the project at the same time.
This is not meant to be an official Picture Transferer. More like a proof of concept. I (might) add to this later.