I'm playing around with creating a xibo module. I have been able to get a custom module installed but I'm not sure if I'm understanding how the getResource method works. I am embedding an iframe using an edited getResource from the website module. I see a preview/thumbnail of the region in the layout designer, but when I preview the layout I don't see the region. I see that the iframe isn't included in the preview html. Does the preview get its html from another method?