The odd thing is that if I copy and paste some of your links into a reply, the preview renders them alive.
One UN-explainable.
These are posted on my site at Yuku and when posting them there had to break the link in order that the address only (NOT the actual video pic} would be seen. Really did not wish to embed the link into the post. Prefer visitors travel to You Tube to watch rather than the personal site.
When making posts, I’ve encountered that if I put in any other HTML codes in my post like paragraph (p) or break (br), I have to then do ALL my links and pictures in html, too, in order for them to show up correctly.