I’m building a course in GitHub using Course-in-a-Box, and I’m having trouble embedding some YouTube videos. I’ve tried copying and pasting the available code in the “Markdown & Media” submodule, and I end up with a message that “YouTube refused to connect” on my course page. Is something broken? Is there something extra I need to do? This is all very new, so I’m unsure what I even need to troubleshoot.