Signer Attachments: Supporting Files for Signing

Files a recipient uploads during a signing request, separate from the document they are being asked to sign.

Published on

2026-11-06

Last updated on

Attachments are supporting files supplied by the signer.
Mandatory collection controls completion, not authenticity or identity.
A signer upload differs from an agreement attached to an email.

What are signer attachments?

Signer attachments are supporting files a recipient provides as part of a signing process. They differ from the main agreement supplied by the sender and from a completed agreement attached to a notification email.

How are attachments requested?

Sign.Plus lets a sender request files from a specified signer, with instructions and mandatory or optional collection settings. The request should explain which document is needed rather than leave the recipient to guess.

Uploading a file is not validating it. A submitted identification image does not by itself verify identity, and collecting a certificate does not confirm that it is current or authentic. Request only relevant information and apply appropriate handling procedures.

How do attachments affect completion?

A required upload is an additional action within the signature request. It differs from filling a text or signature field. Check the remaining request actions as well as the presence of an uploaded file; document review can still be needed after submission.

A Common Case: Collecting a vendor’s supporting document

A Florida property-management company could request a maintenance vendor’s insurance certificate with its service agreement. Staff would state the requested file clearly and review its contents separately, rather than assume that uploading a document establishes valid coverage.