Due to purchase sync issues with Google Play, the phone app is now free and the Wear OS app can be unlocked through an in-app purchase after a 30 day trial. If you bought the app while it was paid, the purchase should transfer, but please contact me if you are asked again.

Use the Play Store on your watch to install the app. If your watch does not have the Play Store, you can obtain an APK to sideload from the phone app.

NavMusic provides the ability to play offline music on your Wear OS device with a clear, simple interface. Go on runs or workout without carrying your phone around. Transfer music quickly and easily and quickly directly over WiFi or Bluetooth. Transfers can be done from the phone app or NavExplorer.

Features:
*Pause, Play, Skip, and Seek commands with Bluetooth support
*Playlist support
*Search functionality
*Group by album and artist
*Play by folder on watch
*Downloads album art and artist images from Spotify (Does NOT sync music from Spotify)
*Ad free interface

It appears the Sony Smart Watch 3 is unable to transfer the app via the Play Store as it no longer receives updates and the Mi Watch does not include the Play Store. If you have either of these devices, you can download the latest APK in the phone app's settings and side-load it manually.