I can connect my Fenix 6 with the Wahoo Kickr Core trainer and manually adjust power/resistance of the kickr using the watch. When I follow a gpx route it seems to work - my position on the map is at the start of the route and when I start cycling it moves accordingly. However, the resistance of the kickr doesn't change throughout the whole course. When I store the activity it showed an absurd elevation gain, something like 180000 meters, no idea where that came from.
I also saw that there's no elevation field when using the 'indoor cycling' activity. So maybe it's just not possible?
I just want to follow a gpx, have the kickr adjust its resistance according to the elevation meters of the gpx and see the elevation I did in my activity at the end.