Embedded video shows while editing form but not in preview

I am trying to embed MP4 videos into my form.  I looked at the support suggestions and did use the text feature with <> embed code. The video plays in edit mode, but doesn't show up in preview or view modes.

It is likely due to the browser blocking mixed content.  Since your video URL is not using https, the form which is using https is blocking the non-secure content.

Here is a quick example.  If you view my test form from this URL, the video will not show:

https://form.jotform.com/70366153519962

However, if you view it from this URL, it will:

http://form.jotform.com/70366153519962

In my example, I am using an iFrame widget to add the video:

http://widgets.jotform.com/widget/iframe_embed

Either change your form URL from https to http or host your video on a secure domain.