As far as I know only those gpx files can be imported to garmin connect that are created by a garmin device. 3rd party files (komoot, alpenvereinaktiv, ...) can only be copied via USB connection into "new file" directory of the device. I would like to import all gpx files from the web or - even better - from the iOS App.
The reason is that I do not want to carry a notebook in my vacation.
I do not understand the reason for this limitation, to me it seems just annoying customers