Songs youtube?

I do Fortnite montages and have only used royalty-free music so far. Can I also use licensed music? Many sounds also use music without having a license to do so. Does it matter And what would happen if I uploaded a video with music that I don't have the license for?

Is just claimed, so the money what you theoretically do with it then earns the producer.

Will I then get a strike or the video will be removed?

No.

OK thanks

It is possible that the new upload filter from YouTube will not even release your video if you are using music for which a license is required.