Onebox is a really useful piece of functionality provided within the forum, however, from time to time you may just want to simply display a hyperlink, or the full URL of your resource, rather than having it embedded within your post.
Ensure that the URL is not the only text on that line. You could add a bullet point before it, or wording either side of it, which ever is more appropriate;
here’s the link https://www.youtube.com/watch?v=fOHg1_u6ptY
https://www.youtube.com/watch?v=fOHg1_u6ptY <-- URL to our video
Additionally, use the Hyperlink icon on the Composer Toolbar to add a title for your URL, Markdown will then be applied to your URL to create the following in your draft;
which will display this once your have submitted your post;