Installation and server related problems

Hi

Today, I installed via wordpress plugin. 

• I am using MasterStudy theme with WPBakery. It's a multisite.   
• I can create content, import demos and can place it on a page/post. No issues.
• The H5p content shows when I "preview" the page /post. 

Problem 

• The H5P content does not show when I publish a page of post.  ( During the preview, it is visible)

I am attaching 2 jpg files.  The error indicates towards  " H5PIntegration / missing translation).

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In order to give your bug report the best chance of getting answered, please include the following information:

1. Detailed steps to reproduce the bug (exactly how and when did it happen) 

when adding for instance interactive video, it keeps "loading please wait, forever.

1. Platform and version number. E.g. Drupal, Wordpress, Moodle.

moodle 3.8

1. Mobile or Desktop

desktop

1. Browser: Chrome, Firefox, Safari etC

CHROME AND VIVALDY

1. H5P plugin version

last one

I am new to H5P. Having installed the Wordpress plugin i have hit a frustrating problem early on. Can you guess what it is?

Any mp4 or webm that i upload gives me the error (read slap in the face) as soon as i try to either view it or add interactivity to it. Where do i find any information about supported file types that actually work?

What is meant by video format? encapsulation or codec? pixels or aspect ratio? file size? these are terms i understand.

Can somebody please clarify "Video format not supported."