By default, a video or audio file plays one time when you tap the Play button 
. You can have it repeat in a loop and adjust its volume.
Tap the video or audio on the page to select it.
Tap 
, then tap Movie or Audio.
To set media to repeat, choose how you want it to play:
Play in a continuous loop: Tap Loop.
Play forward and then backward: Tap Loop Back and Forth.
Note: Recorded audio can’t loop back and forth.
Tap the video or audio on the page to select it.
Tap , then tap Movie or Audio.
Drag the Volume slider.