Error: This content is blocked. Contact the site owner to fix the issue.

This error appears when trying to view the Google Document template from within the Opero Documents Template Builder in Salesforce. The Google Doc template is not visible.

The cause for this error is due to your Salesforce org blocking external websites. Go to Setup>Security>Trusted URL and browser policy violations to view violations. We iframe the google doc in the document action page. 

To fix, add google.com to the Trusted URLS in your Salesforce Setup.