Interactive video is not working (Joomla)

I have followed instructions for installing and creating an article with an H5P interactive video and everything in the article shows except the H5P video. Admittedly I am no expert but having followed all instructions so I am at a loss as to why it's not working. All I can figure is I am missing something that's probably very simple. This looks like a fantastic addition for my site and would very much like to use it. If you could help me out it would be greatly appreciated. Thank you.

Here's where I'm at...follow instructions to create new interactive video. The placeholder shows in the article creation area but when I save the article it does not show in the published article. When I go back to edit the article the placeholder icon is no longer in the article. The instructional video is for Drupal so I wonder if there's some small difference in Joomla that's messing me up.

I'm sorry for the late reply. I didn't get a notification when you created this discussion. Do you know what rich text editor or theme you are using in the admin interface of your site? I must either try to set up a site similiar to your to figure this out, or get access to your site.