Initializes and returns a document picker that can export or move the given document.
- iOS 8.0+
The document to be exported or moved.
Returns an initialized
UIDocument object, or
nil if the object could not be successfully initialized.
In iOS 10 and earlier, this method returns the document picker view controller from the most recently used Document Provider extension. If no valid Document Provider can be found, it defaults back to iCloud Drive.
In iOS 11 and later, it returns the standard browser interface. This interface is the same one used by the