KIO S3 allows you to list Amazon S3 buckets and objects, to upload files and folders to a bucket and to delete objects from a bucket. You can also copy folders or objects within S3, as well as move or rename objects.
You can use the s3 KIO worker like this:
s3:// or s3://.mybucket/mykey
The first URL shows all your S3 buckets.
The URL s3:// lists all the files and folders
from your mybucket/mykeymybucket bucket.