You can now access directly to your Parse Server media files (jpg,png, mp3, doc, ppt, key, pdf....) on your S3 private bucket. And publish a HTML website on you Public S3 storage.
Exemple with CyberDuck software and the Public Bucket.
1) Install a cyberduck software
2) Go to Symbyoz Console >> Project >> Cloud Storage and copy past Access Key and Secret Key
Finish !! The files are now online.