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Here is the original document.

The original image was copied and converted to a smart object.

I added the smart Camera raw filter as described in post #5.

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Now I want to add noise to the BG.

I enter the smart object and make my changes. Save

This is the PSB files layers panel.

Note that I again used smart objects and filters for editable and non-destructive editing.

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These are the (exaggerated) noise changes to the original document.

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