You can link to your Google Drive documents and images from the Task Properties dialog.  

  • Select a task in in your project.
  • Open the Task Properties dialog (Either double click the row OR highlight task and select the gears icon on the toolbar)
  • Select the "Links" tab
  • Click the "Add" menu button.
  • Select "Google Drive", the Google Drive file selection dialog will open.
  • Select the document or image you want to link.