In our experience, most of the time Meta will automatically recognize and tag the music on your reposted video if it can find a matching audio.
However, this isn't guaranteed. We recommend periodically checking your reposted videos to make sure the correct music was applied, especially if using copyrighted audio is important for your account.
If you'd rather not repost a specific video because of its music, you can exclude it before it's posted:
Go to your Scaled Creator Dashboard.
While the video is still in Pending status, find the Auto Post column.
If it says Included, click it.
Select Exclude to prevent that video from being automatically reposted.
This gives you full control over which videos are reposted while allowing you to skip any videos where you'd rather not rely on Meta's automatic music matching.