routeCourse - https://apps.garmin.com/en-US/apps/b...3-474e97f376ac

Downloads routes over Bluetooth or Wi-Fi from many different places: connect.garmin.com, ridewithgps.com, strava.com, mapmyride.com, mapmyrun.com, outdooractive.com, bikemap.net, openrunner.com, runnermaps.nl, mtbproject.com, hikingproject.com and trailrunproject.com. Also can directly upload GPX, TCX, KML and KMZ files.

Uploading is done from https://dynamic.watch/ website. Help: https://dynamicwatch.zendesk.com/hc/...11-routeCourse
IMHO this is by far the best way to upload routes. No need to play with separate apps from different services, this one supports pretty much everything. If you pay premium (one-time payment of $29.99) then there are some extra features (https://dynamic.watch/premium).

BTW, they also have related app dwMap (https://apps.garmin.com/en-US/apps/2...c-57acc7ce4870) which I find useful for navigation (e.g. hiking) on devices that don't officially support navigation (like my Garmin Venu 2 watch).