Open URL option allows to open diagram exported as URL, insert it into the page and, if necessary, update it using the editor. The opened diagram will be saved in the page’s attachments.
After the Open URL button click, the following dialog will be shown.
After the URL is inserted, the Open button click opens a diagram editor setting the uploaded diagram as a source.
When you have finished working with the diagram, click the Save & Exit button to save the changes and exit editor or Exit to discard the changes made (if any) and leave.
After that, you'll see the preview of the uploaded diagram.
