CDN Configuration on Sub Folder Multisite

We are using Multisite Sub Folder configuration with third party host (level3). It appears all is working and sending to the CDN properly and working properly for the main site. However, for users sites on the multisite the URLs become broken. The setup on users sites have the username then wp-content/uploads/…..:

ex: https://CDNsubdomain.CDNdomain.com/USERNAME/wp-content/uploads/sites/5/2015/03/Untitled11.png

However, if you remove the USERNAME to related file url structure, such as:

ex: https://CDNsubdomain.CDNdomain.com/wp-content/uploads/sites/5/2015/03/Untitled11.png

It displays the media or image file.

Any suggestions or configuration considerations is greatly welcome.

https://wordpress.org/plugins/w3-total-cache/