Surely you want to enable 802.1q? Like, that is vlan aware switching and routing. Or is that on the nas?
Edit:
Some troubleshooting:
Connect a laptop into the same subnet as your Nas (so same vlan and IP range/subnet) and connect to the nas. This either eliminates the NAS or the router from the equation
Im 99% sure any piano tuner worth their salt tunes by ear