Fat32 limited to 4GB, if your dump more than 4GB use goldleaf + goldtree to install over usb.
If you sx os user, you can use sandisk dual drive usb type-c for installing your nsp/xci. Format your thumbdrive to exfat and sx os can read those flashdrive directly from your switch
Once again I fell down the martial arts rabbit hole and am plumbing the murky depths of the internet's various martial arts and fighting crafts echo chambers.
If you're not actively involved and only get up to speed every few years or so, you can see the tide of public opinion flapping worse than my dong while I'm skipping naked down a hallway.