Backcountry Navigator Help

I generally consider myself reasonably PC savvy, but getting GPS tracks/files onto my tablet has frustrated me to no end. I’m about ready to order a Montana and try my luck with it, but thought maybe someone can help me out.

Equipment: Samsung Galaxy Tab 3
Program: Backcountry Navigator Pro

I’ve tried downloading GPS files on the PC and then transferring to the tablet. When I tried to download files directly on to the tablet it did not work. When I hook the tablet to my PC via a USB cable, it beeps but nothing pops up on the PC screen like most instructions say it should. What am I missing? Do I need a special program on the PC to do the transfer?

What file formats are supported by Navigator Pro? It seems like so many of the files are in the Garmin img format.