Is there a reason when I try downloading layovers, they are not coming over as MP4s and are a blank download that I am not able to open?
I am not sure what you mean by a "Layover" Are these video files ? Where do you download them from also?
If you're talking about Overlay videos, these will be downloaded as .webm files, not mp4. The overlay videos have a transparency in them that mp4 doesn't support.