Photo Stitcher make long and large picture, panorama photo by take up to 3 landscape photos or 5 portrait photos by the Camera or import from the Photos then app will stitch into one large image. Stitched image looks like a photo just take from one shot from camera.
How to stitch pictures, make panorama picture: take photos from camera that having a little overlap area from one and another, e.g. take 3 landscape photos from camera (from left to right or vice versa) photo 2 must have a small overlap area with photo 1 and photo 3 must have a small overlap area with photo 2. Then app will stitch all your photos by comparing the overlap area for matching and then merging to 1 smooth picture.
Photo Stitch pro: merging photos is burden job so for higher devices model will make better result. With the effort to make best result for you, by the testing from our side we recommend that using device models released from 2017 or later..