Built-in feature for live wallpaper with custom audio

hey everyone! i was recently going through my gallery and i stumbled across this screenshot. i remember seeing this tiktok video about this feature a couple years ago. no, its not some app ive downloaded. im pretty certain it was from my settings. i can choose my wallpaper (live.) not the regular wallpapers you choose (its a temporary wallpaper) amongst all the other wallpapers you can choose from; all wallpapers are LIVE (they all move.) you can then select your song of choice (not from apple music.) the feature in setting comes with it. any assistance would be greatly appreciated

here is the old screenshot ive taken