Follow a route/course during activity

Fenix 7 noob question:

I have a .gpx route I wish to follow whilst tracking an activity (bike ride). I am getting totally confused as to how I start n activity, whilst getting my watch to navigate around the route(?)

  • I have added the .gpx file to Garmin Connect.
  • I have created an activity, on my Fenix 7 (solar sapphire), for bike rides.

I looked through the Garmin online manual but could not find what I needed.

Can anyone help me at all?