The default image is wrong (it's the one for cloze text)
It's not easy to drag&drop video/sound/text to speech because when you start dragging, it could have confusion with playing video/sound/text. I think we should consider using three-dots to move items in Reorder template like we finally done in Sugarizer Server: https://github.com/llaske/sugarizer-server/issues/87
That's very good. Two remarks: