To display external resources such as images, stylesheets, scripts or embeds that you've coded into the HTML editor, you'll need to add each external domain/sub-domain into the "walled garden" list under Edit Network > SSID #1.
To display external resources such as images, stylesheets, scripts or embeds that you've coded into the HTML editor, you'll need to add each external domain/sub-domain into the "walled garden" list under Edit Network > SSID #1.