Installation and server related problems

I am following the instructions at https://documentation.h5p.com/content/1290398146464789848 to set up H5P for our test environment for the 30 day trial to consider puchase and it's not working.  When I go to "Inset Stuff" the H5P option is not available. 

Hi!

This is really cracked the nuts here when I spent 3 days and night in row to create H5P slides. Now the time that I'm ready to meet the clients, all the images and the videos have been deleted or removed from my slides!! Only texts left. The H5P files are confidential and I can't share it with anyone. They are all belong to my clients. Can anyone help me what to do here with this issue?

More info that you perhaps need:

Website: Wordpress latest version 

Plugin: H5P plugin v1.13.1

Feature: Course Presentation and Question Sets

Just updated the H5P plugin on my Pressbooks site to 1.13.1 and when the plugin is activated, it renders the workspace blank. See attatched screenshot. When it is deactivated, the workspace returns.

Wordpress 5.1.1
Pressbooks 5.6.5