I'm trying to set up my Gotek emulator.

I've formatted it with 100 partitions. I've written 3 images of MSDOS 6.2.2 for each disk fine. However, when I "Open" Disk 3 to copy files over (HWInfo) it just opens to my Documents folder in Windows. Windows shows the contents of Disk 0 in my usb stick permanently. I can't get it to open Disk 3, or any other disk. What have I done wrong?