First time using it, a detailed drawing vanished

The app seemed great initially. Simple to use. Nothing to distract you from the task at hand. Then I created a detailed drawing. I switched away from the app to do something else and when I returned, the drawing was gone. It wasnt in my photo library. No UNDO auctions could retrieve it. It was simply gone. Ive used other apps many times and never lost a drawing.

Mystimus about Whiteboard - Infinity Canvas