Consider third-party camera ... icon in the top right of the screen. If the icon has a line through it, the feature is disabled; you can tap it again to turn it on. Press the shutter button ...
Point your camera at the object you want to capture and tap the shutter button (the white ... to perform a reverse image ...
To enable Motion Photo, tap on the Motion Photo icon at the top of the screen. It looks like a triangle play button inside a ...