A few days ago I posted on Facebook a story that had a photo and some text. In the text there is a link to a YouTube video.
Facebook shows the photo and the text, the link to the video is just a hyperlink with no preview. It has always behaved this way, as far as I remember: a photo and a video in the same post are not both previewed.
The same post shown on Knil doesn't show the photo, it shows the video preview instead. It would be good to have both on Knil, it would be better the Facebook itself! But, the photo is more relevant to the post than the video, actually the photo _is_ the post (and the text is its caption, the link to the video in it is a plus).