Assignment: Annotate PDF - Download all annotated PDFs (as Zip)

Setup:

1. Login as Admin.
2. Create a Course.
3. Enrol a Student into the Course.
4. Create an Assignment activity with File submissions and Annotate PDF feedback enabled in the Course.

Test:

1. Login as a Student.
2. Go to Course.
3. Go to Assignment.
4. Add and submit a file submission (.pdf)
5. Login as Admin.
6. Go to Course.
7. Go to Assignment.
8. Click on 'View all submissions'
9. Click 'Grade' on the Student's submission,
10. In the assignment grading page, there should be a generated preview page of the Student submission
    1. Using the available tools, draw or add stamps on it to generate the the annotated feedback file.
    2. Save changes.
11. Navigate back to the view all submissions page.
12. Select some or all submissions from the table
13. Use the 'Download all feedback' in the 'With selected...' dropdown.
    1. confirm an alert is shown requesting to confirm the action
14. Click 'OK'
    1. confirm this starts a download process of a zip file
    2. after the file is downloaded, confirm the zip file contains the annotated pdf versions of the selected submission(s).