Images are stored in Google Docs. Placing these images in Placeholders with the Image Gadget works beautifully. If the same image is placed in Placeholders with Image Widget/Custom URL, the images appear in Preview after a brief delay with a message indicating images are being loaded (every time for each image, btw). These images will NEVER appear, however, on Chrome Player on Asus Chromeboxes. For now, I guess I'm going to have to continue using the Classic Editor and Image Gadget—knowing that at some point it will be disabled.