First, you need to make sure that they are in fact YouTube and Netflix. Nowadays there are many different websites that include videos for the lesson. Are those websites blocked by your school or just suggested not to use? I feel like administration should already be aware of this, as they are required to check in on classes every once in a while. I would bring it up casually, since you are not trying to get her in trouble. My suggestion would be to say "hey I have noticed you use a lot of manipulatives in class like visual aids and videos - what website do you use? I would like to explore my options since we aren't allowed to use youtube."

Discuss with the teacher what her goals are with having youtube or netflix playing, and make sure that you are talking to her in a professional, non-confrontational way in which you can promote learning. Do not outright tell the team leader before you are sure that it is Netflix or Youtube.

Were all a team here. So, I think that talking to her first would be the right thing to do

If they are meant for teaching content I wouldn't consider it an issue. As long as they are appropriate and not disruptive I don't see any issue

I would try talking to the other teacher first on why they are showing these videos to their students if there is a policy against them, since you may not know if she has permission or not.

I would go to my team lead about it. It's school policy, there's nothing you can really do about it.

I would say see what the videos are! My CT uses Brain Pop a lot because the videos come with quizzes, so she could be using different resources. If you find out the videos are YouTube or Netflix, then I would talk with her privately before discussing with the team because maybe she has a reason or needed an extra reminder. Finally, if she keeps showing the videos after you talk, then it could be worth bringing to the team.

Having a direct conversation with the teacher could help you gather more information about your concern to better determine your path. During planning meeting you can discuss the use of media in the classroom and state that certain websites are not allowed. It would also be beneficial to provide an alternative option so that the teachers lessons are not hindered.

I agree with the other comments that it is important to first discuss this with the other teacher because in todays day and age there are so many different ways for media to be shown.

I would talk to the teacher first and see if she is in fact using it. If she is, maybe remind him/her of the possible consequences of using it.

Remind her that about the videos and then ignore them. The teacher is not harming anyone, and you do not want to come off as not a team player.