Gets the email setting overrides for an envelope

Adds or replaces a document in an existing draft or in-process envelope. An in-process envelope is one that has been sent but not yet completed or voided. **Note:** When adding or modifying documents for an in-process envelope, Docusign recommends [locking the envelope](https://developers.docusign.com/docs/esign-rest-api/reference/envelopes/envelopelocks/create/) prior to making any changes. To add a new document, set the `documentId` path parameter to a new document ID. To replace a document, set the `documentId` path parameter to the document ID of the existing document. The tabs of the original document will be applied to the new document. For example, a request in cURL looks like this: ``` $ curl --location --request PUT 'https://demo.docusign.net/restapi/v2.1/accounts/0cdb3ff3-xxxx-xxxx-xxxx-e43af011006d/envelopes/ea4cc25b-xxxx-xxxx-xxxx-a67a0a2a4f6c/documents/1' \ --header 'Authorization: Bearer eyJ...bqg' \ --header 'Content-Disposition: filename="newDocument"' \ --header 'Content-Type: application/pdf' \ --data-binary '@/location/of/document.pdf' ``` <ds-inlinemessage kind="warning"> If HTML document files contain <code>&lt;img&gt;</code> elements with the <code>src</code> attribute set to a path or URL, those images will not be displayed. Images in HTML files must be encoded in Base64 format, like this:<br/> <code>&lt;img src="data:image/gif;base64,R0lGODlh...IQAAOw==" alt="Base64 encoded image" width="150" height="150"/&gt;</code> </ds-inlinemessage>