Disclaimer; I have no Mac-specific experience, but the Mac-shell is fairly similar to the FreeBSD shell.
Hi! There are two ways for a NAS to interact with an operating system. Either via proprietary drivers and software that allows you to interact with the NAS via a program, or using a more basic approach where the NAS is mounted to the filesystem. The latter is most common.
My first tip would be to check if your NAS is in fact mounted to the local file system. This can be done by going to the system console, or shell, and type in ‘mount’. If your NAS isn’t showing on the list, that’s most likely your explanation.
You could also take a look at your static mount-file, by typing in “cat /etc/fstab“. If there is nothing pertaining to the NAS here, my advice would be to find the device name for the NAS, and mount that manually. This may be done via command-line at any time, and made permanent by adding it to /etc/fstab.
Good luck!
BR Tord