Initially, the file was loading up fine in Cesium Viewer last weekend when I first uploaded the file to my online File Manager (on HostGator). About several hours after that, the CORS error occurred and the file was no longer being loaded up. I spoke with HostGator customer service about it, and they ended up fixing it.
About a week passes, and the CORS error is showing up again. I’m not sure what exactly is causing this problem.
My subdomain, where CesiumJS is installed, is visualizer.existentialresearch.com.