I was expecting the preview player on the upper left of the video page to use the selected player from the setting on the filetype. But it seems that the player on the upper left corner always require a preview in the additional files section. With only the VideoPreviewPlayer configured, I was expecting the control not to complain but use that player to play the original file instead of the additional file.
But now there is a hard dependency on the additional file to be present for this page to work.
Customer support service by UserEcho