So I’m kinda tired of Garmin apps needing internet all the time. Also it’s an extra step for me to first upload my GPX files in any Garmin app before I can sync it to the watch. And the Garmin apps don’t make sense to me. The libraries are overly complicated (for my use)
First: Connect your Garmin watch to your device.
Make sure the Garmin watch is in USB storage mode (in the settings)
Second: Open the watch in your file explorer and navigate to the "NEWFILES" directory.
Third: Place your GPX file there.
As soon as you disconnect the watch, the files there will be imported into the Courses folder and you can use them for your activities.