Have the S20 ultra, galxay watch 4 and this app. Can't add music to the watch (follow all the correct procedures) using Samsung Music and the Spotify watch app is so glitchy and slow it works 10% of the time. Have to question how it's so hard for Samsung to get their products to talk to each other. Watch is basically £250 junk (and I was putting up with the 1 day battery)