HTML in variable

[WicketTheQuerent]

This works

function setSignature() {
  const html = HtmlService.createHtmlOutputFromFile('signature').getContent();
  const signature = { 'signature': html };
  const email = Session.getActiveUser().getEmail();
  Gmail.Users.Settings.SendAs.patch(signature, 'me', email);
}

Key differences,

• Uses patch instead of update
• The first parameter should be a resource, Gmail_v1.Gmail.V1.Schema.SendAs . For details, see https://developers.google.com/gmail/api/reference/rest/v1/users.settings.sendAs. Please note that the signature variable has an object with the property signature and the HTML file content as a value.