Can you elaborate on this? As a Silicon Valley engineer, my first reaction to your earlier post was that you must be referring to Network Attached Storage. However, I couldn't think of a typical scenario where you'd actually want to upload a file from SD card to network storage. If you have network storage at home, it was probably where the file came from in the first place! You'd be using network storage to download to SD card, not the other way around. Is this what you meant?
I Googled, and discovered that the acronym NAS also refers to "Network Audio System" (
https://en.wikipedia.org/wiki/Network_Audio_System,
http://www.aes.org/networkaudio/). This does make sense in the context of Poly, if it can play from its SD card to a network based audio system. So it would help if you could clarify what you meant.