Problem with Embedded Video with custom player

Hi, I’m trying to use embedded video in the courses, and lessons in my school.

As we are testing,
– I’ve pasting <iframe> with details similar to your docs on the ‘text’ mode of normal editor.
– The video i embedded is from YouTube but is has custom player on top of it
– As, i preview, it showed the custom player perfectly. But as I use the permalink to the courses section, it revert back to normal YouTube video!
– I don’t know why or which config make it delete the js player from showing?
Is there a way to show the custom player?

Thank you,