This is a minimal app with no instructions. What you won't know is that in the upper right corner is a button that allows you to select a remote camera. Once that happens you can take a snap, but it is hit or miss as to what you get. Perhaps you have framed it correctly and perhaps the camera settings are good. I tried it once, fumbled around and managed to have my iPad trigger my iPhone camera. But the image wasn't the resolution and aspect ratio I expected. The screenshot the iPad showed was not scaled and oriented correctly. So. it is a minimal app, none of the camera features one needs are there. I might use it once or twice, but it just lacks any polish or minimal UI sophistication.