When playing songs in the Sonos App, there is a red heart mark on the playback interface of QQ Music, NetEase Cloud Music, and Spotify. Click it to add the song to your favorites. The most important thing is that it can be synchronized with the playlists in the apps of each music platform, which is very convenient. However, when playing Apple Music songs in the Sonos App, there is no red heart mark. If you want to add a song to your favorites, you can only add it to the Sonos App, and it cannot be synchronized with the playlist in the Apple Music Appp. It is very inconvenient. I hope it will be improved!