Images in templates - where to store them?

In reviewing the Gotenberg websites, it says that images can be referenced in the HTML templates as long as they reside in root level directory (see Routes | Gotenberg).

Does that translate to a particular directory within Corteza (either the server or compose directory)? Or someplace else that I can place images for rendering through the template engine?

@tjerman You know more about this than me, any thoughts?