You can attach a file to an announcement for users to download.
In Course Navigation, click the Announcements link.
Click the Add Announcement button.
Type a title in the topic title field  and write a message in the Rich Content Editor . Click the Choose File button .
Browse for File
Choose the file you want to attach . To attach the file to the Announcement, click the Open button .
Click the Save button.
Once you save the Announcement, it will show up on the Announcements page.