I have the same problem withe the mobile version of Android: The app hangs when I try to apply the GPS fixes recorded with the app to a dive downloaded from the dive computer with the windows version of subsurface.
I am using the latest beta version v3.0.9 running on android 10. computer is a suntoo d6
I also hjave another question: how can i delete all recorded GPS fixes ? I have loads of then, also some broken once from a prior bug withe a timestamp of 1/1/1970, which is fixed now.