I have an iPad 3 using the latest OSI. I can open MP4 video files that I've placed in Dropbox (currently watching Dexter, Season 6) with no problem. But I can't close the files. I currently have six of them open, but try as I might, and googling for answers, I can't figure out how to close individual video files one at a time. I can move to another file via the Home Button, but when I come back to Dropbox, all the open files are the for me to swipe into existence right to left, but they remain with no visible (obvious?) way for me to close them. So thanks for your input with what will probably turn out to be a simple fix. Good night.