Its a galaxy watch and everything is up to date. On the phone music screen there is no 3 dots or the swipe up menu that the watch view has. The track is always listed as Unknown too which is probably related to the issue. The phone is a OnePlus3 running android 8
The Samsung watch Music App detects which music related apps you have installed and can bet set to talk to any of them. I can't say why you don't have the dots. Do you have the latest Samsung updates installed? Google it maybe?
For instance I'm using it to control the BBC Sounds music app.
If you don't have the three dots downgrade the Spotify app for now. I posted links on the previous page. I prefer this as it's proper Spotify integration.