I'm sure this has been asked many times before but I couldn't find the answer. Apologies upfront!

I have my Deco system set up in router mode. The main unit is connected to the WiFi Router/modem that my broadband arrives through. The WiFi for this router is switched on and is used and some devices are also connected by network cables.

I want to know that if I connect a NAS to one of my Deco unit, will it be visible/accessible to anyone connected to the main (non-Deco) router? Or is it only visible to anyone connected directly to the Deco units?

TVM.