Any addon that allows me to save a file on product page (backend) hidden from customer

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Hi all,

Ive had a search around but can’t seem to find anything that would work.

I sell antiques, and i’m wondering if on the product page (back end) Is there an addon that would allow me to upload a file (usually PDF purchase invoice, potentially documentation that is also tied to the antiques) so that I can save it for my reference, It must be hidden from the customer.

Any help would be greatly appreciated.

All the best

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