interactive book

Good Evening!

I'm rather new on h5p. I want to thank all the creators for theory work. It's a great Instrument.

I'm about to use the interactive book on moodle platform. As mentioned in other posts, I would love to have a "save progress" option. I Think alot would value  that. 

However I'm dealing with another issue at the moment: each of my sections will begin with a video, followed by links and some geogebra-applets. 

I am starting an online course site on which I'm using H5P's interactive video and interactive book content types in a course I'm selling. I want to respect the rights of the creators, so is there a recommended way to attribute these content types beyond showing the H5P toolbar with the link to the H5P site? Or is the idea that I can use these freely?

I am using the audio recorder in the interactive book, but the Submit button does not appear. As a result, students are unable to send their audios!
Has anyone experienced this problem?