When sending a document for signature using a template, I need the ability to attach unique, signee-specific PDFs that will be included in the signing package. This feature is called a Signature Bundle. This is not the same as uploading a PDF to the template itself, which would apply the same file to every signee. Example: I have a term sheet + contract that exists as a prepared PDF template (with signature fields already in place). For a specific customer, I also have a valuation document that is unique to them. When I create a signature request from the template, I should be able to attach this unique valuation PDF so that it is appended to the package and signed along with the template documents. I benefit from not having to add the signature fields each time. This behaviour is supported by many other e-signature providers.