Board Thread:Support Requests - Getting Technical/@comment-32778375-20181128084910

I want to add a video:(https://www.youtube.com/watch?v=VGXQ9Rl-v5k) on zh.tos.wikia.com but I always see warning message says:"Video embed failed, unable to get proper thumbnail." why is this always happening,please check this problem

P.s. I "think" this problem probably related to the cache of video upload tool,because I forget to click the "release" button on the YouTube upload page and try to add a video immediately,but this tool can't grab the video's picture and information again right away,so shows the warning message.

(I'm Taiwanese,my English isn't so well,sorry for bothering) 