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If you have entered, suppose an attribute "Material" in File->Properties->Attributes and put a value of "ABC"
as well as
in Format->Reference Set->"Model" Ref set (for example)->Attributes and entered same attribute "Material" with a different value, say "XYZ".
and in Drafting file (assuming the drafting file is created by calling/adding the above file as a component), in the Annotation Editor select Relationships Tab->Object Attributes->Select the Component and then select "Material". You can see that the value reflected for "Material" attribute is that of Reference set i.e. "XYZ" and not "ABC".
Conclusion : Reference set Attribute values are Preferred over File -> Properties -> Attributes by NX.