Use APKPure App
Get Theme settings old version APK for Android
Theme settings for galaxy watch
Theme settings for galaxy watch for your stylish
Open theme setting on Galaxy watch.
Open application on phone. Choose image and edit it.
Then you can preview image.
Finally set background on Galaxy Watch.
You have template theme and store history you set theme
Note: please keep open app on galaxy watch.
Sorry, don't support Gear Sport.