Thumbnail on mobiles?

Hi there, nice plugin! But got one question. How to add a thumbnail to the video? On mobile (tested on iPhone) there is only BIG play button on the centre and dark grey background. It is possible to add thumbs to videos?

My shortcode looks like this:
[evp_embed_video url=”/wp-content/uploads/2018/05/movie.mp4″ class=”fp-minimal” preload=”auto”?loop=”true” width=”1000″ height=”1000″ template=”mediaelement”]

Thanks!