@Brian-McG, I agree. Usually I import the route as well as the track so that are 2 uploads where 1 could suffice. I do this so I can confirm the route to the track, and make changes where needed.
1 - upload file
2 - windows shows contents of file (route, tracks, POI, can all be multiple, technically)
3 - select the items to process into MRA (no matter the type)
4 - press "Process" to get them into MRA