If you've selected to add your music to YouTube Content ID, it will be added to YouTube's automated content fingerprinting database to identify and monetize your music across all user-generated content (UGC) on YouTube.
If you've selected to upload your music to YouTube Music, your music will be delivered to YouTube Music alongside a static image of your cover art, otherwise known as an ‘Art Track’. This video will be posted onto the artist's auto-generated Topic channel.