If you've received this message:

You must allow Exam4 to record using the camera, or to record the screen, and correct the permissions by following the steps below:
- Click the Proceed button if you haven't already done so. If Exam4 is still open, close Exam4 directly by clicking the "Quit" button.
- Click on the Apple menu and select System Preferences.
- Type "camera" into the search field.

- Click on the Privacy tab, scroll down the list on the left, and select the permission that needs to be corrected; such as, "Camera".
- On the right, enable the switch next to the Exam4 app to grant permission.

- Relaunch Exam4 and take your exam.