In this guide, we will configure an AWS S3 (Simple Storage Service) object as the origin site for Alibaba Cloud's Content Delivery Network (CDN).
I just tested it again and again, I am able to point CND to S3, and enable the bucket to be public, also, I can visit objects via my own domain, but I cannot deny access visitings via S3 object URLs, can you please test and give an exact guideline about this requirement? Thank you for sharing