Playing videos
Open the Gallery app 
and select an album. The Play icon 
is displayed on video files. Tap an image to select it. Select the
app to play it (tap the Photos app 
or the Videos app 
), then tap Always or Just once and the video
begins playback.
TIP!
Double-tapping the app (Photos app or Videos app) begins playing the video automatically.
NOTE
Some file formats are not supported, depending on the phone's software.
If the file size exceeds the available memory, an error may occur when you open files.