Just use the normal Windows network share protocol, called Samba in the Linux world. I have to assume that you have already created the correct Windows shares on your NAS? So just follow this tutorial to add the shares to your RPi:
Just use the normal Windows network share protocol, called Samba in the Linux world. I have to assume that you have already created the correct Windows shares on your NAS? So just follow this tutorial to add the shares to your RPi: