"A Windows host shouldn't make a difference"

There is no Host, for NAS. That's why you can attach it physically to your Router.

The issue for NAS is "nonmanaged." The links I provided included other links.

"Lacerte isn't running on it in conjunction with the hosts"

For these types of programs and/or files, you want an installation that is also Managed, to avoid conflicts. NAS = indiscriminating library shelving.

"it just sits there."

Exactly.

"Essentially it's acting as a file/folder share. Is there something I'm missing?"

Not you. Your System is missing that there needs to be some management. This is a known issue for how NAS functions. It is part of the intent for creating and the basis for using NAS.