I went to You Tube, copied a video URL, clicked on the little icon that looks like an old fashioned movie film, pasted the video URL, and got "The specified media URL cannot be imbedded." I tried it again, copying "video URL at current time" and "Imbed HTML." Same error message. So, I went to another site, clicked on the same icon, pasted the same video URL, and came up with an imbedded UTube video. Why?