While I do not claim to understand all of this as I might like, my belief is during a firmware update of the Synology (OS 6 > OS 7) we lost the USB functionality that was. I am no longer able to wirelessly use the NAS "Audio station" while on my home network and must use wire from Dell windows laptop into Schiit, as opposed to the previous configuration of NAS output into Schiit. I hope that makes sense.
Using Windows laptop due to the need for a USB output from source. An old Dell is temporarily plugged in all the time for convenience of not plugging/unplugging connection when using.
Biggest take away is the dramatic difference from Uber to Bifrost. Warmer, richer, more analog sounding!