How do I allow students to attach files to a Discussion?
You can allow students to attach files to a Discussion by changing the course settings. Settings are available in the Discussions Page or the Course Settings Page.
Discussions Page Settings
In Course Navigation, click the Discussions link.
Open Settings Icon
Click the Settings icon to open Discussion settings.
You can also change the Discussions permissions in the Course Settings.
In Course Navigation, click the Settings link.
Edit Course Details
Click the Edit Course Details button.
Open Discussion: Student View
Click a discussion title.
Verify Students Can Attach Files
In the discussion post, click in the Reply field . The Rich Content Editor  will appear. Verify that students can attach files .