I was going to try and transfer video files directly from my PC to S2DT Tivo. However, my PC is not showing up in the Now Playing List. I can transfer Tivo to Tivo using desktop plus (I have two S2DT on my home network). I can play music and photos on the Tivo . The PC shows up in those Tivo applications just not in the now playing list. Is this a firewall setting or something I need to setup via the Tivo software?