I’d suggest it’s a question for the makers of the MyRoute app to answer. It’s their route / track after all.
https://www.ukgser.com/forums/showthread.php/505329-MyRoute-app-Support-website
Failing that, it seems that running the track through BaseCamp and then into a Garmin device works, so just do that.
https://www.ukgser.com/forums/showthread.php/505329-MyRoute-app-Support-website
Failing that, it seems that running the track through BaseCamp and then into a Garmin device works, so just do that.