chenyincheng I have attached test reports for/of/on/about our products for your reference. I would choose "on" in this context, but "for" and "about" would not be incorrect. In my opinion, "of" does not work.
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chenyinchengI have attached test reports for/of/on/about our products for your reference.I would choose "on" in this context, but "for" and "about" would not be incorrect. In my opinion, "of" does not work.