When selecting one of the premade thumbnails to choose from I get an error from Facebook saying the thumbnail is not supported.

When you have real selected and you're trying to use your thumbnail previewer and you select a random thumbnail you get an error underneath the video that says thumbnail is not supported Facebook real will not support thumbnail in the video however when I leave the post type on post rather than real it will allow me to individually select the thumbnail and it doesn't give me an error also I can't preview When selecting a real the thumbnail full screen on the right hand side. It also you cannot pause the real when it's playing or mute the volume when it's previewing in the real section for the post and it's incredibly annoying so being able to change this also would be extremely helpful