You can use Docusign connec subscribe the event of envelope completed to callback Power Automate, then download the document into sharepoint.
https://support.docusign.com/s/document-item?language=en_US&rsc_301&bundleId=gqy1619537336307&topicId=qno1619537607438.html&_LANG=enus
FreeLink/甫连信息
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