I found a solution to mine that's similar to yours. Hopefully it helps. I'm switching from the Samsung Note 5 to the Note 9 and using the Samsung Gear 3 Frontier Watch. I used to manage the apps on the watch using the Samsung Gear App (Open the Samsung Apps folder on your phone and select Samsung Gear). Now the Samsung Note 9 calls it the Galaxy Wearable App (Open the Samsung Apps folder and select Galaxy Wearable ). I now have several music players on my Note 9 (Google Play Music, Apple Music, Samsung Music, Music Hub). First I had to find the music player on my phone that the Galaxy Wearable app uses. For the Note 9, it uses the Samsung Music App. I want to use my watch at the gym, so I created a new playlist for the gym using the Samsung Music App (Select Samsung Music App, Tracks, Press and hold a song, select all the songs you want for your playlist, look at the bottom of the phone's display, Select the "Add" button next to the "Play" botton, create playlist and name it). Now that I created a playlist, I could only get my new gym playlist on my watch by deleting existing music on my watch. To delete the existing music, I had to factory reset my watch (settings, gear info, reset gear). Now open the Samsung Apps folder and select Galaxy Wearable, pair/connect your phone to your watch and set-up watch, within the Galaxy Wearable app home screen -> scroll about half way down and select "Add content to your watch", select Playlist to sync (gym), turn on Auto sync, place the watch and phone on the charger to sync. Place your finger at the top of your phone's display and swipe down to see the playlist being transfered to the watch. Enjoy your playlist on your watch now. Hopefully you found this information and the pathways helpful. If not, oh well, I tried. Take care.
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