TN visa - USCIS or CBP

Hello,

I've submitted TN visa to USCIS. They requested more evidence by fax. I am missing start date of the job and can't wait anymore. Can I bring the requested documents and evidence to the border/pre-clearnace & submit it in person to CBP officer?

Or if they aren't able to access the application at the border, can I just start a new application at the airport in person? Will there be a conflict?

Thank you!