View file offline

How do I view a file offline, such as a video or document or photo? That was a main reason for me getting this, so I could access with my iphone or ipad and download for viewing when offline, like on a plane. Through the iphone ipad app, it is not clear this is possible, thought through reviews and interface show this as an option.

I just figured it out. Didn’t realize you have to slide from the right on the file in the app.