Single Choice Set

custom CSS moodle (or Desktop) doesn't change anything

Nothing ever changes.

i did the H5PMod from

it does need  $THEME->haseditswitch = true;

so i think it is active

I tried setting all the libraries, not just H5P.InteractiveVideo

and various elements, in the custom.css and in .h5p archives from Desktop app.

nothing ever changes.

What can i do to locate the missing piece?