Recently completed a Swift session and downloaded ride to Garmin Connect. All categories downloaded including Heart Rate.I was expecting my VO2 MAX to change but it hasn’t. On the internet several posts say that downloading from Zwift onto Garmin Connect will download HR but it won’t change VO2 MAX. Any pointers would be appreciated.
JG
Hi @JEREMY_GALE,
Welcome to Zwift Forums! I am Nelson from Zwift Support.
Garmin does not update VO₂ Max from Zwift rides because its algorithm only runs when activities are recorded directly on a compatible Garmin device using paired sensors, not when data is imported from third‑party platforms as shared by Garmin here.
While Zwift can send heart rate, speed, and power to Garmin Connect, the Firstbeat analytics engine inside Garmin watches and cycling computers requires native recordings to calculate VO₂ Max, so if you want this metric to change, you need to start the workout on your Garmin device in parallel with Zwift and ensure your heart rate strap and power meter are paired to it.
Do not hesitate to contact us at Zwift Support if you have any other questions or concerns, and we will be there for you.
I was in the same situation.
I resolved this by having my 1030 recording the ride at the same time on a bike setting for trainer.
It does have a distance difference as the Garmin does not run same as zwift on wheel circumference.
To resolve that I save the 1030 ride first and then save the Zwift ride.
Delete the Garmin ride from Strava as its a double.
Go into Connect and then correct the date fields by using the edit facility. I add the ride title, enter the correct distance from the Strava ride details and add the elevation. Then enter details of calliries consumed and drink etc caddy any photos.
Then delete the Strava ride from Garmin.
This does not double your distance from one event on Garmin, as it takes the readings from the 1030.
Bit of a faff, but it’s easy when you get the hang of it. 
Hope this helps.