When you choose to upload an image or file and attach it to a particular piece of content, the database holds that file in the system. 

Where can I see my images and files?
  1. Files and images can be found by first, click on Content in your admin panel.
  2. Select the tab labeled Files.
    Location of images and files
  3.  Click on the file name in the list will give you a preview.

Please note that you cannot remove images or files from this location. Learn how to permanently remove a file or document from your site.