Can't get video previews to work

I am trying to see the video as it's being made, it's been a godsend in SwarmUI. Sadly, I can't seem to get it to work. Everything I read just says I need to enable previews in the ComfyUI manager and they should show up in KSampler. It's just blank though. Any ideas? Thanks.

https://preview.redd.it/h7t7mosckobf1.png?width=626&format=png&auto=webp&s=40794ab0d447c10fd67b52f63dea9986e35be425

https://preview.redd.it/y80k678fkobf1.png?width=457&format=png&auto=webp&s=1735353a167fb2286ad9f8247b4ba295ad30ec1d