wp-pro

The files will be automatically fetched from your origin server, that’s why CDN login credentials are not needed in WP SuperCache. This is called “pull”, where the CDN knows your origin server and caches them on demand.
Here’s how a CDN works.

Ok, there are many reasons for a broken page or wrong CDN setup. It’s difficult to trouble shoot with the information available. WP Super Cache normally works pretty good, also make sure that no other WordPress plugin is interfering.

There are various WP Super Cache integration guides out there. Did you check them?
As a next step, go to the browser console and check for errors. What HTTP error do you get? (e.g. 403, 404, 502, …). Can you share an URL of an asset that is not loading?

Redundant? Not necessarily. It’s quite common to use Cloudflare in combination with other CDNs. A reason for that is that some CDNs offer features (e.g. push zone) which Cloudflare doesn’t. In order to integrate another CDN, choose generic mirror.

All assets must be delivered via HTTPS in order to solve that issue.
WordPress HTTPS is not maintained anymore. I recommend using CDN Enaber

CDN Enabler let’s you choose to serve all assets via HTTPS. This will solve the problem.
Don’t forget to enable HTTPS for your CDN.

In a normal W3TC setup, you won’t upload anything to a CDN. It’s much easier to create a pull zone and let the CDN fetch the content from your origin server. Once the files are minified, the CDN will get the minified files from your server.
If you’re using CNAMEs for the CDN, yes W3TC will replace it. Here a tutorial how to do a CDN integration.

I just checked your website. The sitemap cannot be accessed anymore.
Anyway, the assets are loaded correctly from the CDN:
https://tools.keycdn.com/speed?h=566c3c71178b2515798b4567

Only two assets are still loaded from the origin server, the rest is loaded from the CDN

Looking at the errors on your page, you need to add the CORS header
What is CORS? –> https://www.keycdn.com/support/what-is-cors/

Error message:
XMLHttpRequest cannot load https://1871400763.rsc.cdn77.org/wp-content/plugins/ajax-load-more-cache/_cache/8572847754_pc/page-0.html. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'https://www.ng4a.com' is therefore not allowed access.

You have never used a CDN and you want to build your own CDN?
As a first step I recommend you to integrate a CDN into your WP site
https://www.keycdn.com/support/wordpress-cdn-integration-with-w3-total-cache/

Using a CDN with W3 Total Cache is a separate service. I was looking for a free WP CDN plugin too and I found CDN Enabler . I took the advice from Phil (see above) and started using KeyCDN as well. I’m happy with that setup.