As an instructor, you can add a course file to a page by using the Rich Content Editor.
In Course Navigation, click the Pages link.
Click the title of the page you want to edit.
Click the Edit button.
In the Rich Content Editor, place your cursor where you wish to insert your file.
In the Rich Content Editor, select the Insert/Edit media content button.
Open Course Files
Click the Insert file tab  to access the course files or to upload another file. Click the Course files folder  to open the folder and you can select the file you want from there.
Note: If you do not have any Files uploaded to your course, the folder will not be present. You will need to upload new files .
Click the Insert button to insert the file into your page.
Click to Save your page progress.