Yes, you can use multiple images in a source via the Image Slideshow plugin.

To do this, simply click Add > Other > 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.