I read the rules.
As I mentioned in my first sentence, I did search and found a similar post where someone had to come here directly for a response - https://itch.io/t/253300/need-to-upload-2gb-game
The docs page seems to be tough to navigate to, so I couldn't find the FAQ, but I did follow the instructions for getting CSS Access.
My second email to support is fairly recent, March 4, but my first email about CSS was sent back on February 12. Not sure why I'm not showing up. According to my account settings, I used the same email.