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: