CLONE - A file can be picked from private files for a folder resource and a copy can be made.

Test Pre-requisites:
-The tester should be logged in as a teacher in a course.
-A folder resource should exist in the course and a file in the user's Private files.

Test Steps:
1. Navigate to the folder resource and click 'Edit'.
2. Click 'Add' and verify that the file picker is launched.
3. Select 'Private files'.
4. Select a file, select the 'Make a copy of the file' radio button and click select this file. Verify that the dialogs close and the file is added.
5. Click Save changes/submit and verify that the files have been added.