Wiring Smart Switches with no neutral in one

Hello, trying to wire Ultra Pro Smart switches. I have 1 light with 3 switches, 2 of the boxes look normal with 2 black wires, a red and a bundle of white wires in the back for neutrals. The middle box is the strange one as there are no bundle of white neutral wires only 2 black, 2 red, and a bundle of black wires. I am at a loss for what to do here I think I found the first box with the line and load where my full smart switch goes and the other end will have the add on. But how do I wire the middle?

Use YouTube to find out how 4-way wiring works.

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