Hi Lishan,

The fallback video player may appear due to network restrictions (e.g., if YouTube is blocked in your network, the fallback video player will be used since all of Khan Academy's videos are hosted on YouTube), an unstable internet connection, or a broken link in your browsing history.

I'm afraid that there's currently no way to toggle between YouTube and the fallback video player at will.

I hope this helps! Thank you for being part of Khan Academy!

Dustin
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