Couple of days ago I tried the "scanning" feature. Had dozens of receipts that I needed to scan. I was really impressed with document edge detection. I was also able to stack 2 receipts and scan as one document. The edge detection was failing in some cases. However, I was able to correct the edges manually. I had a document with 2 different color background, the app had some issues detecting the edges on it. It was detecting the only part of the document with same color. But again I was able to manually select the edges and able to scan entire document.