Course Presentation

I only need to create a simple course presentation. But, the dialogue for adding any content does not even open up. For example, I click the Text tool, but the dialogue to add the text never opens. 

I tried three different browsers in two different computers. Unfortunately, nothing works. May I please get some help? Thank you in advance.

Edit:
I'll give the 11-item information as listed at https://h5p.org/forum/9

Hi H5P brainstrust! I'm making a course presentation which, ideally, features some case studies for users to work through. I'd like them to be able to pick which case studies they'd like to work on, and ignore the others. I see there's the 'jump to slide' option with the image choice activity option, but this doesn't get rid of the other options. Is there anyway to allow users to choose which slides to work through and then branch out to the end of the presentation without users having to clilck their way through other, later options that they didn't choose to work on?

We are not able to embed Youtube videos in Course Presentation successfully. Once the Presentation is saved the slide just says 'video player loading' forever (see https://h5p.wlu.ca/content/786). We are using H5P in Drupal, and the same display issue happens in Windows 10 and MacOS, and on Chrome, Firefox, Edge and Safari.

Video file upload works fine but not all content creators have access to the files for the videos they are embedding so this is a major issue.