The song, that’s free to use for YouTube videos, sounds like a jazz song and it’s in the key B-flat minor (I am a music composition specialist, and by hearing it I knew its key). It begins with a guitar loop. Last time I heard it was in 2021 or so, but I still remember how it sounded like. I think that it wasn’t from YouTube audio library either.
I’m not very musically inclined, so I have no idea if this is B-flat minor or not, but what you described kind of sounds like “Jazz in Paris”: https://www.youtube.com/watch?v=mNLJMTRvyj8
It’s one of the songs that you can select from Google Photos when making a highlight video.
It’s not this song. It had sampled guitar loops that similar to hip hop, but it was faster than hip hop