Fullscreen Slider (video and images) – video and button not showing on mobile

I’m using the Fullscreen Slider and my first Slide is a videoslide width a title, a description and a button.
The second, the third and the fourth ones are image slides.
First question: is there any way possible, to let the videoslide show on mobile and not showing the backfall image.
Second Question: when I set an backfall image, it’s showing on mobile, but the button is missing!
It has to be possible, that a video is showing inside the slider on mobile!