It looks like developers were just waiting for Apple to introduce the Files app in iOS 11. Within hours of the introduction of the feature, we’ve seen multiple developers introduce Files support, and it seems abundantly clear the app is going to transform how people approach iOS productivity.
What is Apple's Files app?
Files is Apple’s approach to real file storage, edit and retrieval on iOS. It is an app in which you can access every item you hold in online storage services.
The idea is that you can work on something on your iPhone, edit it on your iPad, and finish up on your Mac, PC or other device. Edits made inside an item in Files or one of the file services it hosts are automatically synced to all the other systems you have that use that service.