Corrijean has a blog about it. http://www.chess.com/blog/corrijean/how-to-post-videos.
I remember a number of members said it only works using google chrome now. (even referencing her blog, I still couldn't get it to work, but many others have)
How to post videos?
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I used to be able to, then something changed, and nobody could.
Now I see some videos again, but the old way is not working.
Let's write a tutorial!