Receive shadows plane and transparency

Hi.

I have some 3D models on a comp, which drops shadows on a floor. My models are 3D unrolled, so I can't apply effects like color grading to them directly. So I turn video footage off and go up into parent comp, where I have the same video footage and comp with 3D models. I wanted to apply the color grading to this comp, but the floor plane which receives shadows is rendering all black, so I can't see video footage underneath.

I've set up floor as 3D white plane, Receive Shadows turn on and blend mode: multiply.

So, Is there any method to apply effects to 3D unrolled layers with transparent shadows casting on a invisible plane?

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