I've played around a bit and now have movies streaming from my 'cloud' storage from Dropbox and GoogleDrive. These are using MP4s
I like this idea because it means I can stream (wifi or data) to watch the movie but don't have to have it on my phone taking up space.
document 5 is a good app from what I can tell but from what I have seen so far it requires you to DL the video to your device files and then it can play the video. This is good but does require space on the device.
Thanks