Check the partitions on the drive. when you create a drive in virtual box I don’t know that it formats it in any way. You may need to format the drive to a valid type such as ntfs and then try to deploy again.
Usually when you push an image to a client and the fog emu pops up but runs by so fast you can’t catch anything, that is because FOG didn’t find a valid drive or partition type to install the os to!
I made a tutorial on using FOG debug mode to create or delete partitions, I would try setting a partition type and pushing the image again. I know for a fact that Virtual imaging works, I can bot upload and deploy to my virtual machines, but I ALWAYS prepare a disk before I image it!!!