I've found some of the lecture slides/pdfs on this public s3 bucket directory, but I cant view all the files in it, even after I put the bucket name into my aws

I've found some of the lecture slides/pdfs on this public s3 bucket directory, but I cant view all the files in it, even after I put the bucket name into my aws console. https://spark-public.s3.amazonaws.com/startup/ https://spark-public.s3.amazonaws.com/startup/ anyone have a list of files in this bucket?