Map a network drive in File Explorer might be another option, although I’m not positive what the NAS is.
Seagate PersonalCloud shows some of this confusion over what the NAS is, but some of it might help…
Possibly you could ask the person there who got it working for some specifics of what they saw and did. UNC might work, File Explorer might, or net use might. Use the Reply button directly to the right of post:
which way you go is probably a matter of preference, convenience, and what obstacles the NAS poses.