On some instances of Simple Storage, file editing and deletion is limited or removed. This is not by accident and was removed from your instance for a reason.
Some instances have their own additions to the original code, such as the ability to edit text (and most code) documents right in the application. These buttons typically appear in the list of Actions on the right side of each file thumbnail and URL.
The delete all files button will appear on instances with no limitations applied. It will not be available on most instances, because it allows you to instantly remove all files from the