Dropbox is a creative collaboration space designed to reduce busywork, bring your files together in one central place, and safely sync them across all your devices—so you can access them anytime, anywhere. And sending large files is easy, even to people who don’t have a Dropbox account. Features like the doc scanner, shared folders, offline access, and more make collaborating with others …
: https://play.google.com/store/apps/details?id=com.dropbox.android&hl=en_US