Saving Server Space
Try not upload any images or video to your course page. Rather add the media to a folder on your GDrive and embed from there.
There is a trick to embedding video from GDrive
Change the end of the share link from "/view?usp=sharing" to "/preview"
e.g. If this was your share link:
then your iframe code becomes something like:
<iframe src="https://docs.google.com/a/solwaycollege.school.nz/file/d/0BywT-sZljxKNajVEZlNEZHpCRVk/preview" width="480" height="360"></iframe>