If you need to retrieve information stored into your S3 bucket please follow these steps.
I´m still trying to recover protected files, this tutorial is about public files.
1 - Create your bucket and upload your file(s) according to this link
2 - Make your file public and copy the URL
3 - Into your Sense (Desktop, Enterprise or Cloud) create a connection to your URL using "Web File" type
4 - "Voilà", your file is there, you can use it in your app
Be happy, be Qlik