Hi Alex,
The ZenCache Static CDN Filters do not upload files to a CDN, but rather when a page on your site is loaded, all links to static resources on that page are replaced with links to your CDN. Your CDN then figures out if it already has a cached copy of the static resource and if it doesn’t, it will go to your site and fetch a copy.
For more information about how this works, please see How do Static CDN Filters work?
If you have further questions regarding Pro features, please open a support ticket, as per WordPress Forum rules we’re not allowed to discuss or provide support for Pro features here.
