At the beginning, I copied the code from a voki video and pasted it directly after I clicked the <html> of the page in my google site. However, the voki video won’t show. I searched online but didn’t find a good solution. I subconsciously changed all the http in the codes into https, and it worked! Now I can see the voki video embeded in my google sites. This method also works for the GoAnimate videos. Hope this will be helpful for others.
