You can grab a link to a file by clicking the link icon to the right of the file you're interested in. A window will open up where you can copy and paste a direct link to that file, that you can post anywhere else to allow people to access that file directly.
Our files system can be used for storing images, CSS, Javascript, and other files for use in your emails, wrappers, and the like.
To find a link to a folder, click the folder to navigate to its contents and grab the link in your browser's URL bar.