How can I change a document and put the correct documentation after I sent it

Hi,

you can "correct" the envelope to change the documents after you sent it.

Please see the following DocuSign support article on how to achieve this:

https://support.docusign.com/en/guides/ndse-user-guide-correct-documents

If a signer has already signed the document, it is too late to make changes via "correct".

In this case you should void the current envelope and send a new envelope with right documents.