Just a bit of advice to make things easier with the Garmin.
Download the GPX folder from Gpsies and then upload it into Bikehike Course Creator here, then save it/download it to your PC as a TCX file (you can rename it to something you’ll recognise). Plug your Garmin in to your PC then copy and paste your downloaded TCX folder into the ‘New Files’ directory on your Garmin. Unplug your Garmin and then turn it off and on again. The new file will be in your ‘Courses’ folder and then you can either follow it or Navigate with it (You can go into the course settings to change whether it’s constantly displayed, has navigation points etc).
Works every time, and for some reason just putting a GPX file someone sends me into the New Files folder does’nt !