Hi. I don't own this NAS - What settings do you use, are both systems in the same WORKGROUP?
It's just a wild guess, but maybe the issue lies with the type of permissions.
Windows 3.x does support "share-level access control" for CIFS, I think, which is password/folder oriented.
Edit: Or was it the other way round ? 🤷♂️
Then, there's the permissions issue on file system basis, but a NAS should take care of it, I suppose.
Re: Windows 98 PC suddenly stopped appearing in the Network on my main (Windows 7) PC
Edit: https://www.paultclark.com/os/nt/samba.html
"Time, it seems, doesn't flow. For some it's fast, for some it's slow.
In what to one race is no time at all, another race can rise and fall..." - The Minstrel
//My video channel//