Technically the computers and the NAS are all on the same network, operating on different media (2.4GHz wireless and 5GHz wireless and possibly some sort of wired link) - assuming you haven’t given a different NAT setup to your 5GHz wireless connection?
My Pi, NAS storage, Router and laptop are segregated by different media - the Pi is on a powerLan connection, the NAS is wired to the back of my Mac Mini, that is wired to the router by 1000Gb ethernet and the laptop/iPad/Android Tab/Phone are all connecting via either 2.4 or 5GHz Wifi. In addition, there is a wireless extender upstairs (big house) working on a different SSID - but it all works swimmingly.
The key is - can you ping all the elements? If you can, the chances are they all can see each other too.