Publish to Video - initial frame display

Storyline Support, please help!  I have the same issue John noted above two years ago.  My team is creating several videos for a Rise course.  The videos built in Camtasia, pulled in as mp4s, show the starting screen of the video in rise before the play button is clicked. But the Storyline videos don't behave this way.  It starts as a black screen.  I need it to show the first frame of my video, like the other videos so they all behave the same. Which is also why I am bringing the storyline videos in as mp4s instead of as storyline blocks.  We need all videos to look/feel the same for the learner but need to use different tools for building them based on the content we're showcasing.  So how do I fix this? It doesn't appear John's question from two years ago ever had a solid answer.