Depending on the type of field you used for your upload element, there will be a few ways you can locate the documents your client attached to their template.

If it was a dataset element you'll be able to navigate to the page within the clients record and locate any attachments here.  You can click on the attachment to view/download it.
 

You can also view a list of attachments on the engagement through the engagement details panel.

 

 

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