Airport Extreme

I have an AirTies modem with a USB port. I disabled wifi on the modem and connected an Aiport Extreme Base station to the modem -with a cable (I, now, see download speeds of 90-100 Mbs). Infuse for new Apple TV recognizes the modem and reads the disk connected to the modem without a problem. However, Infuse does not see/recognize the Airport Extreme. Can you help? Modem is located upstairs and in a very difficult place to reach and it is a nightmare to insert/eject the disk.

Have you activated disk/file sharing on your Airport Extreme?

Yes, disk/file sharing is active.