You knew this was coming, right?
For years and years and years and years and years and years now I've begged and pleaded for two things ? a Files.app repository and DocumentPicker API from Apple to make iOS file management easier. Last year, with iOS 8, Apple provided the DocumentPicker as part of iCloud Drive. This year, with iOS 9, I hope they finally provide Files.app as well.
Full story from the iMore Blog...