How to check whether document is signed or not in DocuSign Integration?

Hi All,
I have a requirement to send the document to sign to the user through Docusign and save the signed document in the Appian folder. I implemented DocuSign integration and used "create and send envelop" operation. It is working fine. I am using the "Download document from envelope" operation in Docusign integration to download the signed document from the envelope and saving the document in the Appian folder.

I have to check whether the document is signed or not before downloading the document. Please let me how can I check that document is signed or not in the Process model before the flow goes to download the document integration node.

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