I also bought a SanDisk Cruzer Ultra Fit 32GB USB3.1 Flash Drive specifically for a new UNRAID build because I wanted to replace a 10+ year old 2GB USB drive i was using... I think it is a little silly so limit modern hardware such as this, the USB Creator should just work.
Edit: works just fine doing it the manual/legacy method!
I have to agree, these themes and to me in particular the font is horribly annoying to read. If you got a typographer in here they'd probably run away screaming.