Hello @ebouch35
Thanks for posting about this.
You can record and upload activities from your Apple Watch to Strava one of two ways: using the Strava watch app or the native Apple Fitness app. As long as you are recording GPS data on your watch, a map of your activity will show up on Strava.
With the Strava watch app, activities are synced directly to the Strava mobile app on your phone. Using Apple Fitness, activities are stored in Apple Health and synced to Strava once a connection between the two apps has been established.
Please review instructions here.
I hope that helps. Please let us know if you have any questions.