The same does not happen with Wikiloc files. Does anyone know why Komoot files might not show up on Basecamp? I assume they are standard GPX files?

Funny, I just looked at that site this morning and wondered if it was worth exploring further. You read my mind and answered my question before I even thought to ask it! GPSrChive is not only the best resource for us Garmin handheld users, but clairvoyant also!