You'll likely have to use the Static Website Hosting option in the AWS Control Panel. I personally have never used it and am not sure how it works. I may render the S3 folders as HTML, but I am not sure.You'll have to research and test.

See the section in the linked page called "How to Find an Amazon S3 Bucket Endpoint (external site, not vetted by MSP360):
https://havecamerawilltravel.com/how-allow-public-access-amazon-bucket/

But first you'll have to make the bucket public. You can do this in CloudBerry Explorer by right-clicking the bucket name or folder, select ACL Settings, and then click the Public (Everyone) button, check the Apply for All Sub-folders and Objects option (if that's what you want), and click OK.

Having said that, I do not recommend you make buckets or folders public as anyone can find them and download your objects. Not sure what use case you are trying to solve, but there might be a better, more secure way to do what you need.

More information here if you run into issues as public access may be disabled globally:
https://aws.amazon.com/premiumsupport/knowledge-center/read-access-objects-s3-bucket/