Can't get an image to show up – Sketchar: AR Drawing App Review

Have a flat piece of paper, excellent lighting, and four circles. They stay lit up in green and then... Nothing. Able to change some sort of slider (left to right, I'm assuming the "opacity" mentioned in the tips), but that does nothing. Overall, frustrating. Was super excited for this app.
Review by OutsideTheBoxThinker on Sketchar: AR Drawing App.