In Garmin Connect the gpu is not visible.
But with Garmin Basecamp I see the file on my VA3. But where I can find the gpx file on my watch?
What is the purpose? The Vivoactive doesn't do navigation so I'm not sure what you're going to do with the file once you get it on the watch.
What I have done:
The downloaded course gpx file converted to a gpx track by www.gpsies.com/convert
In connect.garmin.com uploaded the converted file. In Connect the file is visible.