Each email product template user admin can customize the message & be drop passing the html layout as it is like. User check out his order he is drag redirected to order page with the section to upload his document user attention message. Messages settings admin can change each attention message woocommerce given below admin can change the order status when user documentation checkout file is approved admin can change the order status when user documentation rejected front end upload document before upload documentation. Manage rejection reasons you can manage rejection reasons &