This is a Wear OS app to trigger the native camera on your smartphone. The app works by using the Bluetooth HID Device API from Android.
The app most likely has problems connecting to the phone. I was able to trace this back the problem to the Android API, but could not fix it. That's why I have removed the app from the Play Store.
I will therefore not develop the app further, everyone is free to analyze the problem further and make suggestions if necessary.