Vanilla Raft runs fine. From steam, I set it to run with compatibility layer Proton 9.0-4.

When I follow the modding site's instructions here, Bottles launches steam, which launches the mod loader, which asks me to find steam's Raft folder for it. But I can't find it.
Within the file navigation window that pops up, I go to Z:\ drive, then \mnt\thatoneHDDfullofsteamgames\SteamLibrary\steamapps\common\Raft, but the Raft exe isn't shown.

What should I do? Or is there another way I should try?

I'm sending this from my phone, so I apologize I'm not sure what the best way to provide clear screenshots is