How do I allow students to attach files to a course discussion?
You can allow students to attach files to a discussion by changing the settings from the Discussions page. Any attachments added to an ungraded discussion by a student are copied to the student's user files and count against the user quota. However, attachments added to a graded discussion are not counted against the quota.
This setting can also be changed from the Course Settings page.
In Course Navigation, click the Discussions link.
Click the Settings icon.
Edit Discussion Settings
Check the Attach files to discussions checkbox.
Note: Unchecking this option will restrict students from attaching files within Discussions. This permission affects posts in new discussion topics, discussion replies, and discussions within course groups.