Actually this is bug.
when i see videos from moodle mobile it automatically downloads.
I want user must have option to choose to whether video download or not. feature should be able to display size of the video too so that user will realize whether he have sufficient space .
it should be ask user to be download or not. because large files (each file of nearly 500 MB) can make mobile storage full. if the video is downloaded then there should be option to delete that video. issue was raised by Daniel Palou year back.( MOBILE-1612 ) i hope Moodle team will solve this issue at priority level.