To use a resizable image, perform all the steps you do with the multi-partition image. Then sysprep the system before you upload. During the sysprep, set the system to shutdown rather than reboot. Then setup the upload job and turn the system back on. It should work better for the resizable. I haven’t verified all of this with Windows 8, but I have to do the same thing for Windows 7. The only major difference (unless going to EFI/Secureboot) between Windows 8 and Windows 7 is the Metro interface. So theoretically the same steps should be able to be followed.