Can I upload an activity from Strava to Garmin Connect....

JUst found this app called "syncmytracks": https://syncmytracks.com/

not sure if it does the job with the new garmin API

Did you get an answer for how to do this?  the Trek Central app for bikes only allows you to export to Strava or Kamoot, but I record everything else on Garmin.  Hoping there's a solution!

On iPhone, RunGap

I can confirm that RunGap for iphone can sync old activities from strava to Garmin

Perfect!

Hi! Since I was not aware that I needed to start my watch every time I did a training ride I had uploaded my fit file from my cycling app (FulGaz). I did this, replacing my fit file by my strava file, for the last ten days that Garmin did not compute my data (because I was using a «not supported » app. After doing that, Garmin Connect did not adjust my metrics, that is, it does not add the charge of my training nor the status of my training. Consequently, according to connect I am still « undertrained » although I ride on my bike trainer almost everyday at a sustained level. Is there anyway around it or I should simply forget those missing data? Thank you.

It's a shame that Strava -> Garmin export is not working. This way users without "Connected GPS" are actually able to reproduce this feature on any watch where HR broadcasting is available. 

I'm not sure if Garmin API has this limitation intentionally