So I have a bunch of video files that I put into a folder and then hid them in the gallery, but when I go the "video" in the gallery they are still visible. So how can I have them totally hidden?
Find the video files with a file manager. Rename them - put a '.' (period or full stop) as the first character. (So MyVideo would become .MyVideo.) Then it's invisible to anything on the phone. (You have to set your file manager to show hidden files first, or you'll never be able to get it back without a PC. Windows doesn't care what the first character is.)