Hi Lindsey,
Sorry to hear that you ran into this issue.
I wanted to share that there is an open issue in Replay 360 where the resulting video output is blank if you insert a video with large dimensions and a picture in the project. If you're adding an image file to your Replay 360 project, removing it before publishing should correct the behavior.
If you're not placing any images on your project, try repairing your Replay 360 installation to see if this fixes the issue. If the problem persists after performing the troubleshooting steps, please open a case with our support team here so we can check what's causing the video output to be blank.
