Re: what is the procedures to free some space on my ipad to download videos?
See how much storage you've used on your iPhone, iPad, and iPod touch - Apple Support - http://support.apple.com/HT201656
Check the cullular data usage on your iPhone and iPad - https://support.apple.com/en-us/HT201299
Texas Mac Man post (2/10/2012) on "Other" data on iOS device - https://discussions.apple.com/thread/4386138?answerId=19861751022#19861751022