I am using W3TC for self hosted CDN and it works perfectly for everything except NexGen Gallery.
I have add
wp-content/gallery/* to the
Custom file list but galleries/images are not copied over to the CDN.
This used to all work before
wp-content/ was moved to being a NFS mount but I'm not sure how that would affect this.
My php skills are not up to scratch but I have been trying to read the code to find any clues but can't see anything obvious.
Here is a screenshot of the settings.