Certain situations require signoSign/Universal to send requests to third-party servers. Remote saving is a specific example of this. This is when a document that is to be saved is uploaded to another server as a multipart upload.
The REST API allows cookies to be attached to a Viewer (POST /Viewer/cookie), which are transmitted to other systems along with all requests. Only cookies intended for the domain set in the cookie are sent.
All cookies are stored until they are explicitly deleted or the instancetoken to which they belong is revoked.