Ellis Hamburger, reporting on Box's new cloud sync system for The Verge:

Until today, you'd have to manually pop a document out of Box, edit it in QuickOffice, then re-import it into as a separate file. With OneCloud, you can tap "Save back to Box" which seamlessly saves your edits into the file stored on Box's server. This means Box's useful version tracking is left intact, whereas before, you'd be left with multiple files out of order.
Box's system is off to a great start with support for a wide array of filetypes, thirty iOS apps that have now been updated with support for it, and even OneCloud for Android in the near future. Even though Apple has already done this with iCloud, the integration in most apps isn't all that great right now and really won't be until OS X Mountain Lion, so I'd highly recommend checking out OneCloud.