Bugs in content types

I have a Wordpress site and added the H5P plugin.

I created a very simple exercise: http://www.ngils.be/schilderijen/

I copy the embed code from the exercise:

Good Afternoon,

Once you activate surface mode, there is no way for students to reach surface mode, which prevents their scores from being recorded by the LMS (Canvas in this case). It seems highly irresponsible, as I use surface mode to ensure that students are taking notes and not just skipping to the questions at the end of the content and then going back for the answers. That there is no way to record student scores without allowing them to return to the content defeats the purpose of surface mode.

1. I created a video with mp4 format, uploaded to Vimeo Pro. Tried to embed it in a new H5P interactive video module; it doesn't display, a message in Step 2 (Add Interactions) says 'Video format not supported.'

2. Wordpress 5.3.2, PHP 7.3.

3. Desktop.

4. Same issue in Chrome and Safari.

5. H5P 1.15.0.

6. Interactive video editor, just updated it.