I'm also using the mobile version of Twist Movie, but I can't cache it without registration, so I can't explain it in detail. However, I still recommend a method to you, hoping to help you: download an x-p file manager (see screenshot for full name, which is very useful), and then use the storage partition function to view it. Folders will be arranged from large to small, and a video should occupy a relatively large amount of memory and should be in several folders on the mountain.