I'm assuming you're using Docusign through Lacerte, so if you're not, these instructions may not help you.

First step (not req'd, but it makes it a lot easier), map your SV to a local drive (Z:)

In Lacerte, you'd go to the "e-signature dashboard" tab, and click "download" for the one(s) you want to save, and navigate to the Z:/Clients/... to save it.

If you don't map a drive, you have to save it to your computer and then drag-and-drop to SV.

FWIW, I don't do this. Maybe I'm too trusting, but I've got it in Lacerte/Docusign, and that's enough for me.