How come I can't record to the StudioLive 24 III SD card from my Stagebox StudioLive 24R through the network?

I was going to record a live show with the StudioLive 24 series III mixer using the built in SD Card recording feature. I'm also using the StudioLive 24R setup as a stagebox to the mixer using the AVB Audio Network. I have signals ruing into the chaels both from the mixer inputs as well as from the stagebox (separate chaels of course). I found I can only record signals from the built in inputs on the Mixer and none of the digital signals coming in from the stagebox. The inputs coming from the stagebox are recorded as blank audio files? I thought the point of this system was to be able to record live shows, but the stagebox seems to defeat the purpose. What am I doing wrong? Why can't I plug into the stagebox, send those signals to the board chaels and record them to the SD Card when there is clearly signal coming in? Please Help?