Can document recipient attach an additional document?

Hi Donnal,

Yes, the sender can attach the document if the attachment field is added to the form sent for signature.

When you send a document for signature, make sure that you check the box for "Preview and Add Signature Fields" before clicking on the Send button. 

Then on the preview page, you can add the File attachment field to the PDF document.

Refer this link Field types to check the form fields types available in Adobe Sign.

Take help of the steps provided here Assign form fields to recipients to assign the form fields in Adobe Sign.

Hope that answers your query.

Let us know if you need any help.

Regards,

Meenakshi