If you’re using a PC, make sure that it isn’t adding an extra extension after the .gdb or .gpx file extension. That seems to be a common problem when uploading into Basecamp for PC owners.
You need to go into file explorer and have it show all extensions. You’ll know you got it when you can see them on all the other files. Just delete the extra extension it added by renaming the file without it.
That could do it.
Or we can just beam it to your Nav VI at breakfast using the miracle of it’s bluetooth connection.