I just setup my windows vm. But i’m unable to view the usb device (thought it would just show up normally on the vm’s viewer). Under ‘File’ I see ‘usb device selection’ but the only available option are my camera, cdrom & bluetooth. Luckily under ‘Preferences’ I see 'folder sharing 'so I thought I could just copy the file to my host’s ‘Downloads’ and just get the file from there after selecting ‘share folder’ and selecting ‘Downloads’ but wasn’t quite straightforward on that option.
You could use file sharing via RDP instead, that may be easier.
Or mounting the USB drive on the host and sharing it as a filesystem using the disk device type.
See Instance configuration - LXD documentation