JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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If I understand you correctly, you would like to add another video on your form together with the other videos right?
Unfortunately we don't have a video tutorial about adding 2nd or 3rd video. However, you can just simply add another video widget like YouTube widget inside your form. Here's a guide on how to add widget to you form.
Hope this helps. Thank you.