Checkout field editor custom field editor does not appear on the packing slip

Hello,
We are using checkout field editor plugin to create additional custom fields at the checkout. In the checkout field editor plugin setting there is a section that allows for integration between the woocommerce packing slip & invoice plugin and their custom fields. The custom field designated in the checkout field editor to appear in the packing slip DO NOT APPEAR at all. We are using WCFM marketplace plugin and we are creating a gifting area at the checkout with the checkout field editor. All the additional custom fields created within the custom field editor appear everywhere expect the actual packing slip. Any idea on how to show those custom fields in the packing slip? Thank you!