Here are the steps on how to set up a custom logo for DGLux.
<server_root>/www/oem-login/images (this step is required if you’re using file, not the external URL to the image later)."customLogo": "https://www.google.ca/images/branding/googlelogo/1x/googlelogo_color_272x92dp.png""customLogo": "../../oem-login/images/logo.png" – path here points to the same folder from the previous step.You should see your logo on the login page and in the designer.