Are you trying to get these combined prior to uploading to DocuSign or are you attempting to download multiple PDFs from an envelope into one PDF? Please provide more details on the Use Case, and I can attempt to help further.

Hi, I am trying to combine separate pdf’s into one pdf as it is uploaded to Docusign. This way once the recipient signs, they will have only one pdf and not multiple pdfs to deal with. The only thing I liked about Authentisign was it would do this automatically. Can I get Docusign to do this? Kind Regards, 

Based on the following DocuSign video, it is possible if using DocuSign Transaction Rooms (Real Estate), which I have never used before (typically I use the general DocuSign web interface which does not seem to have this same option to Combine PDFs). So it seems specific to using Transaction Rooms, is this what you use?

https://support.docusign.com/en/videos/DocuSign-Transaction-Rooms-Combining-Multiple-PDFs