How can I add videos?

First you need to upload them to some video sharing site like Youtube.
Please note that videos do not appear in PDFs!

For example Youtube generates something like this:
<iframe width="560" height="315" src="//" frameborder="0" allowfullscreen></iframe>

1) click the source button

2) insert the HTML code provided by YouTube or other website

3) click the preview proposal button

4) the video appears

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