If you store course materials in the Course Files area but want to add a file or files to an area in the course (course documents for example) you will attach those files through the Build Content Option in the Content Area.
To attach files to a content item
From the course menu, select the content item where you want add a course file.
On the content item page, point to Build Content, and then click File.
In the Select File section, click Browse My Computer to locate the file you want to upload. When you have found the file you want to add, click Open.
Fill in the Name box with what you want the title to be. You have the option of changing this name and changing the color of the name.
Select Yes to Open in New Window.
In the Standard Options section, select the availability options for this file. Set time and date restrictions if necessary.