download from mywhoosh

from what i recollect, only Garmin (or Tacx) tracked activities count towards vo2 and all related metrics, as calc occurs on spot on device. so whoosh won't do this for you.

i did whoosh but tracked activity (indoor bike) on my watch, with connected trainer and hrm and this way i got proper matrics. since tacx is integrated with garmin, that's another working option and probably edge would work too for vo2 (don't own it so can't confirm). so in short, only native garmin solution can add vo2 to your profile.

(never tried zwift so sorry, this may have been another working thing)

VO₂max and Training Status are processed from compatible certified apps only. MyWhoosh is not one, but besides Tacx and Zwift, there are a few other 3rd party certified apps, like for example Rouvy, TrainerRoad, Concept 2, and perhaps others.