newsupernova/vendor/dotmailer/dotmailer-magento2-extension/view/adminhtml/requirejs-config.js

var config = {
    'paths': {
        'fancybox': 'Dotdigitalgroup_Email/js/node_modules/fancybox/jquery.fancybox.pack'
    },
    'shim': {
        'fancybox': {
            exports: 'fancybox',
            'deps': ['jquery']
        }
    }
};