Attachments for Joomla!

The 'Attachments' extension for Joomla! allows files to be uploaded and attached to articles and other types of content. 'Attachments' includes the ability to attach and edit files from the front end as well as from the administrative back end. There are options to control who can see the attachments and who can upload them, along with many other options to increase its flexibility and usefulness.

http://extensions.joomla.org/extensions/directory-a-documentation/downloads/3115