
On your smartphone directly download the .gpx file from a web service or app, attach the file to an email on your computer send it to yourself on your phone, use a service like Google Drive to temporarily store it and transfer it to your smartphone, or connect your smartphone to your computer using a USB cable and transfer the .gpx file to your smartphone using the file transfer feature of your operating system, or some method to get a .gpx file onto your phone.

Open the Garmin Connect app on your smartphone.

Tap the Menu (the three lines in the upper left).

Tap "Training & Planning" from the list of options.

Tap "Courses" and then tap the "+" button in the top right corner of the screen.

Tap "Create a Course".

Select "Import" and browse to the location of the .gpx file you transferred to your smartphone.

Tap the .gpx file to select it and confirm the import by tapping "Import" in the top right corner of the screen.

Once the import is complete, your new course will be available in the "Courses" section of the Garmin Connect app. It is also available on the Garmin Connect webpage on a computer.