Uploaded Document Attributes section

lastUserDocumentAsAttachmentURL Useful if you want to have an URL of the uploaded document that can be displayed in chat and you will always download on click
lastUserDocumentAsInlineURL Document as "view inline" on click. Useful if you want to use this link in a WebRequest or externar API invocation to get the document content

Lead info Attributes section

decodedCustomJWT When the end-user (lead) is strong authenticated this JSON object contains certified info from the authentication provider. To get certified email use {{decodedCustomJWT.email}}. In the same way you can get firstname {{decodedCustomJWT.firstname}}, lastname {{decodedCustomJWT.laastname}} or custom attributes, i.e. {{decodedCustomJWT.attributes.SSN}}
strongAuthenticated Indicates that the current user logged in the chat session with "strong authentication"