This is how you upload a file to the Media Section of Umbraco.
1.) Log in to Umbraco.
2.) Click the Media Section icon in the lower left.
3.) Right-click the folder in which you want the file to go under, and click "Create".
4.) Enter the file's name, and choose media type "File".
5.) Click "Choose File" in the Upload File area.
6.) Select the file you wish to upload and click "Open".
7.) The file is now in your Media Section. Now to get the link/url to that file, simply click the file path which should now appear in a blue font.
8.) A new window will open, and the address bar will contain the link/url to the file you just uploaded.