Please stop embedding files/images from Discord. Discord has anti-hotlinking logic in place that breaks links to Discord hosted files and images when linked to from anywhere outside of Discord. There are a multitude of file/image hosting sites you can use instead.
(more info here)
Shall I do <a href='http://www.thegreatcourses.com/tgc/courses/course_detail.aspx?cid=2270' class='bbc_url' title='External link' rel='nofollow external'>this</a>, <a href='http://www.thegreatcourses.com/tgc/courses/course_detail.aspx?cid=700' class='bbc_url' title='External link' rel='nofollow external'>this</a>, or <a href='http://www.thegreatcourses.com/tgc/courses/course_detail.aspx?cid=7261' class='bbc_url' title='External link' rel='nofollow external'>this</a>?