[SOLVED] I'm dumb, what does this plug, from the 4000X RGB, connect to?

Jan 8, 2022
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jpaterson.ca
I have the Corsair 4000X case that comes with three fans on the front panel. When I was putting it together, I only saw one cable for the fan which I plugged into one of the channel fan ports on the MOBO, which is a B560-A.

This only powered the top fan, and only the fan itself, not the lights. There's a node on the other side of the case that has three plugs in it, which is obviously for the RGB. There's also this cable, which I can't find a port for on the MOBO. The picture is from a Reddit thread that someone posted, but went nowhere.

Why am I dumb and can't figure out where this goes, which I assume will not only provide lighting, but also power the other two fans?