I'm following along with the Windows 11 Clean Installation guide. I've downloaded the installer onto my D drive, which has tons of space, and I've inserted a blank USB flash drive. Installer runs fine, but I get to Step 4.5 ("Select the bootable USB flash drive...") and I'm not given the option to select any drive.
I click Next and I'm told that C drive doesn't have 8GB of free space. (Which is why I want a clean install on it. Lots of old stuff.)
How can I install a bootable install of Windows on a USB drive if I don't get the option to install it on a USB drive?