Login into Blackboard Learn as an administrator

Create a new Original Course and create an assignment

Access Student Preview and submit the assignment

Exit Student Preview and save data

Create a new user. Enroll the new user as an instructor (it doesn't work if we enroll as instructor an administrator account)

Go to System Admin > Course/Organization Roles > click on the instructor role chevron > Privileges > make sure 'Add/Edit trusted content with scripts' is restricted

Login as the new user, access the course and go to Full Grade Center

Locate the attempt for the preview user, click on its chevron and open the attempt

Open feedback to learner (click the blue horizontal bar that contains a chevron that is located below 'Attempt' field)

Click the 'A' Symbol to open the Full Content Editor in the button bar for the text editor

Write anything and Click on Submit or Cancel