Does Blinds material need to be added as constrution material for Daylight analysis?

I’m doing a daylight analysis and I want to see the effect of blinds on the windows. But when I add blinds to the window construction material I hardly see its effect in the simulation results. I have been doing Point in time analysis.
Am I doing it right? Please let me know.
Also, If I’m trying to deconstruct the construction material from the model Im getting an error that this construction set is not available in the library. How to verify that the material you change has been assigned properly?