You can add a COVER IMAGE in Google Docs now but make sure that you're in Pageless format!
Google continues to add new features to Google Docs all the time and Cover Image is a great one! It's only available when you're in Pageless format so be sure to switch to that if you want to try out Cover Image. You can switch to Pageless format by clicking on Format and Switch to Pageless Format or by clicking on File, Page Setup, and selecting Pageless. When you're in Pageless format, Google Docs look more like a web page and when you add a Cover Image, it looks even more like a web page. The Cover Image is wide and goes across the whole width of the Pageless format. If you want to adjust the Cover Image, just click on it and a small toolbar appears at the bottom left of the Cover Image. The toolbar lets you replace the image, reposition the image, add alt text to the image, or delete the image. When you click off the Cover Image, the toolbar disappears. Click back on the Cover Image and the toolbar will reappear.
