The first 10 minutes of the class are for students to watch a video. The co-teacher will enter the class, turn on the video, enable the looping function, then leave the class and enter another class to do the same action.

They have 100 classes at the same time, but there are only 20 co-teachers to handle this, which is why the co-teachers have to leave one class and enter another

Issue: When co-teacher leave the class, video cannot loop and it will stop when the video end