To publish a Google document in the Google Drive Document widget, first you must get the embed code for the document. In Google Drive, open the document you wish embed and click 'File > Publish to the web...':
Switch to the 'Embed' tab:
Click the 'Publish' button:
Click OK to confirm:
The embed code will be generated. Copy it to the system clipboard:
Add a Google Drive Document widget to a flightdeck and click 'Add a document':
Past the embed code into the window and set the height. The default height is 300px.
The document will display in the widget: