Upload a Document Attachment While Signing

A QCDS Document Attachment field accepts one signer-supplied PNG or JPEG image. QCDS verifies the upload, stores the protected original with a SHA-256 hash, and uses the field’s completed-PDF presentation setting without discarding the original evidence.

Choose the Attachment Field

Open the assigned Document Attachment field and choose Upload Image. The current signer flow accepts PNG and JPEG images for this field. Other file types are rejected.

Each Document Attachment field holds one current attachment value. If you choose Replace Image before completing, the new successful upload becomes the value associated with that field.

What QCDS Checks During Upload

The upload does not become evidence merely because the browser selected a file. QCDS verifies that the upload is a real server-received file, confirms PNG/JPEG image structure, sends it through protected intake/quarantine handling, verifies the detected MIME type, and requires a valid SHA-256 hash before the field is treated as complete.

QCDS stores attachment metadata with the signer value, including the protected storage-object reference, hash, filename, MIME type, size, and upload time.

Required vs. Optional Attachment Fields

A Document Attachment field is complete only when QCDS has a protected storage reference and valid SHA-256 hash for the uploaded image. If the field is required, Submit remains blocked until that secure upload succeeds. An optional attachment field may remain empty.

How the Attachment Appears in the Completed PDF

The Template/Request freezes whether the attachment should be visibly presented in the completed PDF. When normal display is enabled, QCDS can add an attachment presentation page to the completed output.

When privacy-obscured presentation is configured, the completed PDF uses the protected/obscured presentation instead of exposing the original image clearly. That setting changes PDF presentation; it does not erase the original evidence.

The Protected Original Is Preserved

The protected original signer upload is retained separately from the PDF presentation. When a completed Request contains signer attachments, the authorized Completed Package can include those original protected attachment files together with the completed document artifacts.

This is why the visible completed-PDF page and the stored attachment evidence should be treated as two related but different things.

Before You Submit

Confirm the filename shown in the field is the image you intended to provide, finish the remaining required fields, and submit only when the transaction is ready. After participant completion, signer editing is closed.

Community Discussion

Want to compare workflows, share practical tips, or discuss how you use this QCDS feature? Visit the QC Digital Signature Community. For private support, bug reports, account-specific issues, or feature requests, use the QuantaCade support system.