Zte Z916BL User Manual page 92

When viewing a picture in full screen, the following features are
available.

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 up in the
filmstrip view. If you accidentally delete one, touch UNDO to
retrieve it.
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