A shutter button sits on the scan screen. A photo taken there keeps the camera position from the scan, so it shows up in the plan view and the 3D viewer as a pin at the spot you stood, pointing the way you looked. Click the pin and the photo opens. With high-detail capture on, these photos are 12 MP.
Photos can also be taken from the project screen with the camera, picked from the library, or uploaded from the browser in the portal. Those get a room and a tag, but no pin.