Workflow Issues when using digital signatures

We're using forms to track approvals for various purchases, and I'm running Adobe Acrobat Pro DC 18.2816. The form is set up with a workflow, so when the first signer digitally signs the document, it'll prompt that individual to add a signature field and email it to the next signer using action buttons. However, if the first signer clicks "cancel" on the Outlook prompt and manually attaches the signed copy to an email, the action button disappears, and I can't find a way to re-add the signature fields. Ideally, we would be able to make the action buttons "reappear" so we don't have to keep sending the form back to the first signers. Is there a work-around to recover the workflow if this happens?