We’ve now improved support for working with content:// URLs, such as those returned from native file choosers, through the AndroidDocument API:
Internally, AndroidDocument uses the DocumentsContract API on Android. As a result, it should be possible to read and write to shared locations, as long as the user has granted access to those locations via the native file picker. Unfortunately, DocumentsContract doesn’t support as many operations as File, so changing the implementation of File directly would have resulted in several unsupported or partially-working functions. We decided instead to add a new class which only supports operations that work on all platforms.