I want send message using postmessage after user watch full video in tutor v17.0.2

i have here u can see


VerticalStudentView.js
is included in iframe but when i put a debugger in that file it did’t worked .
what i want to do is that after user watch video a postmessage is send so that i can handle from mfe side .
i have read Forms post related to this. but i did’t get anything that worked for me.
What should i do for that?