All photos and videos you take with your iPhone camera are saved in the Photos app. With on your iPhone.
Tap the thumbnail image in the lower-left corner.
Swipe left or right to see the photos you’ve taken recently.
Tap the screen to show or hide the controls.
Tap All Photos to see all your photos and videos saved in the Photos app.
While viewing a photo on your iPhone, tap > Apps > Photos, then turn on iCloud Photos.