Yes, you can use multiple images in a source via the Image Slideshow plugin.
To do this, simply click Add Source > General Widgets > Image Slideshow…
Then click Add and choose the images you want to use.
You can also choose the transition you want to use; how you want it to loop; and how long you want the interval between images to be.
When you are done, click Ok to save it.
You can now use the plugin to display multiple images in one source.