It works
1. on App, the first time you access the App you need to access the T&Cs (there’s a tick box towards the bottom); and
2. once in, you need to turn on the WiFi of your action camera (yes these devices have WiFi, no not your home router WiFi);
3. you need to connect your phone to the action camera Wifi; and
4. enjoy!
Also, check if your action camera has batteries or not. If it’s on low power, Wifi function might be interfered.