I subscribed a few hours ago to a Content-Delivery Network (CDN), and I added it successfully in the CDN tab of W3 Total Cache. Nothing happened immediately, but after 10-15 minutes, the images of the home page got replaced with the CDN copies. Great! The problem is that, on the post pages, the images are still not CDN copies. I don't understand why. The images on the home page and those on the post pages should be the same set of images: they are the same files. But for some reason, W3 Total Cache makes CDN replacements only on the home page, and not on the post pages.