It would be valuable to learners that are viewing interactive media on a mobile device that the expand button will temporarily hide the Discussion and Transcript so they can see the potential answers and interact as needed to submit their answer.

Currently, on a smartphone to see the embedded polls, the expand button does not display where you can see all the potential answers, it simply forces you to scroll the screen. Maybe have it open in full screen then when the learner submits their answer. In addition, the Submit button when viewing vertically on your smart phone, you cannot see the Submit button. Also, if a response is submitted in the Discussion panel you can only see it if you flip your phone horizontally same goes for the Submit button.