I made a web part container and I added CSS styles to it. Those CSS styles need some images, so I created the folder App_Themes\Components\Containers\[container code name] and put the images there as outlined in the Containers Overview in the dev guide:

Storing files related to web part containers

If your web part container code requires any additional files, such as images used by the classes defined in the CSS styles property, they must be stored in the ~/App_Themes/Components/Containers/ folder so they can be exported/imported along with the container.

But when I export the web part container, the image files do not export along with the container. Is this structured correctly?