Storyline Interactions in Rise having black mobile player

Hi Caroline, I share your pain. What a disaster. I think that Articulate has some formula for when implementing responsive design on a course block, especially one that's made in Articulate and then plugged into Rise as an Interactive block. I've created extensive app simulations, that started with screenshots from a mobile device. I utilized the exact dimensions, which were 500x1100 to create the storyline course. When importing as Interactive in Rise, I lose 30% of my real estate due to black borders. Even with padding set to 0% top/bottom, it won't stretch even to the top/bottom. I think there is a hidden responsive design algorithm that shrinks according to "something" and then that's what you get. It doesn't factor in your device and maximize the space and stop the size when it maxes out on the width or the height of your viewing device. It'd sure be nice to have adjustments in the settings of the Interactive block other than small, medium, and large which do absolutely nothing for me. I'd love some help if anybody wants to pipe in.