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Not sure if my other post went through. I'm trying to replace a wall switch with the HS200 but the switch does not have a neutral wire coming out of it. Do I still need to somehow connect it? If so, so I connect it with the top white wire or the one from the power source to the GFCI receptacle. Thank you.

You need the neutral, if you're using a GFCI you must use the line in and neutral from the load side of the GFCI. It's a bit difficult to tell from your drawing but that looks like power through fixture so you need to be careful to wire the switch correctly.