Add at least three song links. During a music mission all three appear at once, and tapping one hands off to Spotify, Apple Music or YouTube Music — on iPhone that opens the installed app when iOS allows it.
Add a song
open.spotify.com/track/… (Share → Copy link)
3 more needed for the quick-choice setup.
Picking songs straight from your Spotify library
That needs your Spotify account to be connected, which isn't enabled in this prototype. For now, use Share → Copy link in Spotify or Apple Music and paste it above. Nothing here signs you in or reads your library.