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Swipe horizontally to see more pictures or videos.
Pinch a picture or video to make it smaller. You'll then see a
filmstrip-style view of all your pictures and videos in a row.
Swipe left or right to scan through them all.
NOTE:
You can delete a picture or video by swiping it upwards in
the filmstrip view. If you accidentally delete one, touch
UNDO
to retrieve it.
Double-tap the picture, or pinch two fingers together or
spread them apart to zoom out or in.