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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.
I'll, um... save you the speech on proper posting etiquette and just answer your question.
I assume you mean embedding a Youtube video into one of your posts. As you likely noticed, on the page where you write your posts, there's a button marked 'Tube' that is styled like the Youtube logo. (This does not show when using quick reply/editing posts). When you press it, you will get