cannot create a bootable USB drive for Win10

Hello all:

I am using BootCamp on Mohave and I want to create a bootable USB drive. My USB Stick is 64GB is capacity. The windows image I am using is only 5.08GB. Every time I run BootCamp to create the bootable USB disk, it says it does not have enough space on the target disk. This happens after the formatting and during the copy of the ISO as far as I can tell. I have tried multiple USB sticks and multiple Win10 ISO files.

Any thoughts?