QEMU/KVM Windows 10 Guest won't copy/paste text or files back to host

I am running Debian 9 (Stretch) with QEMU/KVM hosting a Windows 10 - 1809 guest. Using Spice for graphics. I installed SPICE Guest Tools 0.141 and am able to copy/paste files and text from my Debian host to my Windows guest. However, I am unable to copy from the Windows guest to the host. I have tried reinstalling Spice Tools on the guest. I have checked that the Channel spice has been added and it looks good to my untrained eye. I checked the guest log files for errors, with no luck.