Android Smartphones are designed to download local files that you are viewing from the Social Network apps e.g. Instagram, Facebook, Twitter and many more, let us say for example that your friend sent you a video on facebook messenger and you watched it, that video that you’ve watched will save on your internal storage without you knowing it. So after you’ve seen any media contents regardless if you’ve seen it, you’ve watched it or you play it, just go to File Manager then look for Images or Videos and delete those things that you dont need.i can through thi mobile