This is an awesome app. Made very intuitive for iphones. I would give it five stars if there was a way to "save" files. You can create copies but that quickly floods the space and makes for more to sort through.. Plus have to create new copies manually is cumbersome over time. If there was a way to save files elsewhere then it would be five stars. Such as if a file goes south and formatting really messes up I could "open from last save." Or if I accidentally delete a file I could recover it from a different location. The three stars is for the worry of messing up the format and accidentally deleting important information..