Hello,
The New js/functions.js File uses Async JS Loading. By default, all the plugins.*.js Files are in the same Folder as js/function.js File and are loaded from the js/ Folder. However, in case, if your js/ Folder is at a different location you can simply add the following code anywhere on your Page just before the js/functions.js JS File Linking:
window.scwJsPath = 'your-custom-js-folder-location';
Make sure that this is an absolutely URL. Ex: https://your-website/wp-content/themes/your-theme/js. This would make sure that the Plugins JS Files are always loaded from this Folder.
Hope this Helps!
Let us know if we can help you with anything else or if you find any further issues.