Can you explain the correct way to add a co-signature to a PDF. Currently I am adding a digital signature to each page of a PDF using the default method(Adds a field titled Signature1). I am storing this PDF in a database and need to add a co-signer signature at a later date. I have tried opening the document and adding a new signature field on each page and then applying a signature but it seems to corrupt/invalidate the first signature. Do I need to add the co-sign field at the time I am adding the original signature?