You can add multiple images (or logos) to the foreground of any scene. You can also add a single image to the background of any scene. This article deals only with adding foreground images.
To add multiple images to the same scene:
On the upper left corner of your editing page, Click "Add Image Caption" button. .
Upload your first image and position it on the canvas
Click on the first image in the canvas and click the "+" plus sign
Upload your second image and reposition it as needed
Rinse and repeat to add more images
You can add an unlimited number of images to any one scene. Just remember, less is always more. Your video is likely to look better with fewer images.