To add a Google Doc to the Widget Connector Macro:
Navigate to Google Drive
Open the Doc you want to embed
Under File choose: File menu → Share → Publish to the web
Click the Publish button
Click on the Share button in the upper right-hand corner
Change General Access to “Anyone with the link” is a “Viewer”
Click the Copy link button
In Confluence page, click the + and type/select Widget Connector
Paste the URL into the Widget Connector Macro
The document will be displayed in Confluence. Updates to the document will also be displayed.