Hi Joyce! Welcome to Top Trail!
I ran into this a couple years ago with All Trails. If you’re a Pro member of All Trails you can export your track files in the format Top Trail requires (GPX) to generate the map, and add the mileage to your account. So, are you a Pro member? If you’re not, I don’t think it’s going to work. But if you are, you will need to export each track to your computer hard drive in GPX file format then upload each track separately using the “Add Ride” screen under the “My Top Trail” menu. Let me know!!