Can't Install Bazzite Fatal Error, looked at Documentation

I'm at a lost on trying to install Bazzite onto a shared SSD with Windows. I can't seem to get it installed. I've been getting this payload error.

I assumed it was the error 1 issue and attempted to follow Mike's YT video on it but I do not see any sda anything. Could I get some assistance please?

Is there another area in the documentation that I should be looking at?