Made my working yesterday. Was keep resetting settings, reconnect camera good several times. What I did I remove auto reconnection stick from my house wifi, and kept auto reconnect for gopro. And its worked. Was able to watch all my videos.
You have a50 also? I have same issue so will try this if so
I just realize that Samsung have some mechanisms to prevent you from connecting in Wi-Fi networks without internet access... They make the connection from camera like "invisible" because you are already connected in a Wi-Fi... I did the steps that guy said and now I feel awesome using my Hero 7 Black with my A50 ... Everything has a solution, you don't need to change your phone lol, just need to look for it.
every one who read this is looking for a solution, lol. i have the problem that it worked only one time. somebody else have this problem? sorry but to reinstall the app and do all steps again its not a good solution.