Unable to select music from "watch" only

Start with this webpage

https://support.apple.com/guide/watch/play-music-apd70768b20b/watchos

When I launch the Apple Watch Music app I first see my album covers. If I rotate the Digital Crown, I can see

• On iPhone
• Shuffle All
• Library

If I tap "Library", I see

• Playlists
• Artists
• Albums
• Songs

If I tap "Songs", I see

• Shuffle All
• and every song stored on my Apple Watch

I can also tap on Albums, Artists and Playlists and see each of those as well.

Finally, you do need to have either Bluetooth headphones or Bluetooth speakers paired to your Apple Watch to listen to music.

If you are seeing a list of On iPhone, Shuffle All, Library, then you need to turn the Digital Crown in the other direction and you should see the music that is downloaded to the Watch. That should appear there.

When you choose the Music app on the watch, once you choose the album or playlist, you have to choose where you wish to play the audio. You don't have to choose Apple Watch as the source, since the music you see on the watch would be the music you have downloaded to the watch. If you select On iPhone, that is what you are going to see is the music on the iPhone.

To be honest, I've never done that much with Music on my Watch, so I cannot confirm or deny that the choice is a change, I just know that by default the Watch selects music on the Watch. So, for as much as I can tell about shuffle, it would shuffle what is on the Watch. I only have a portion of a single album on my Watch, more for a test to provide answers to other posters, so if I was to do shuffle, it would just be the few songs I have synced. I would change that to test for you, but I'm updating iOS on the iPad (already did the phone) and updating watchOS too, at the same time. Good luck, and enjoy your Watch.