Upload Spotify music? (Films and series, film music)

Hi, you can upload for money on Spotify. Personally, I’m not a musician, but there are songs from films and series that the actor sings, so it’s somehow not an “official” song (for example the rap battle at 8 Mile). Since there is something like that from The Witcher series, I asked myself whether I might be able to upload songs from series and films. Is that legally ok? Or is it more about copyright? Maybe one of you knows about it. Please only answer if you have a plan, don’t feel like a letter from the lawyer or something 🙂