Years of being on IOS, and I was finally curious enough to see what my disk usage is on my 64GB iPad, and even with some games, I'm only using 9GB. So I'm thinking of downsizing to a 16GB model and getting by with loading my iTunes library on Dropbox, and then installing apps if I need them. That said, let's say I have documents, videos and whatever on Dropbox, and I'm viewing them in their app. Does it stream the file and it's removed once closed, or does it store it on the iPad's drive? Do I need to manually delete them each time? Basically, I'm asking if files in Dropbox use up any disk space on the iPad, like it does in OSX. Thanks in advance for the answers!