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I'm afraid that there is no way to give them direct access to incomplete submissions.
You can View-their-Incomplete-Payments, and either copy text from there that you need, or make a screenshot of the page and send that screenshot to them as an image. We do not treat incomplete submissions as regular submissions, so we do not have a way for you to download this data in PDF format or similar.
Please let us know if you need further assistance, we will be happy to assist.