I gave up , after strava stopped working. But decided to give it another try. I am 99% sure GPX does contain HR data, will confirm it later. Also i think i made some progress....there is an app called "health sync", it can sync google fit to samsung health. So it will be....Strava->google fit->Samsung health-> Vitality ... Edit: Strava->Samsung-> vitality was definitely working, not too long ago... beginning of the year for sure. something is now broken with Strava and Samsung