Tracking for activity is done through Canvas. Unfortunately, the Canvas app does not track time spent on an activity, so this time is not visible to the instructor. Please inform the student that they will need to use a computer or their mobile device's web browser to view the videos.
Have them test a video on their browser because sometimes cross-site tracking and/or 3rd party cookies need to be enabled. Enable Third-Party Cookies | Teaching and Learning with Blackboard | Northern Illinois University