(2)Photos in the opened folder are listed in thumbnail. You can slide your finger on
the screen or tap 
to browse photo thumbnails.
(3)You can tap the Thumbnail/Group toggle button 
to display photo thumbnails or group photos by date.
(4)Tap a photo thumbnail to view the photo in full screen.
(5)To display the previous/next picture, slide your finger on the screen horizontally.
(6)To zoom in or out the picture, pinch your finger on the picture.
Display Toolbar
When you are viewing the picture, you can tap on the screen or the Menu icon 
to show a floating menu.
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