Followed all instructions as per QUBES DOCUMENTATION and all seemed to work fine.
FOLDERS appear fine under Fedora but nothing showing with Debian Template - or my VM's which are based on Debian.
Have seen earlier reference to this - but the answer there was that "FILES" was the relevant wording under available Applications (meaning Nautilus in practice). On my Debian-9 template there is no reference to "FILES" or NAUTILUS.
My files still exists - as I can see by switching back to the DEB 8 template - but clearly I want to move forward with DEB9.
Grateful for guidance as to how I can get FILES (Nautilus) back to available applications in DEB 9.
What does it say when you do sudo apt-get install nautilus? (If missing, possibly afterwards also try sudo apt-get install qubes-vm-recommended.)
The sudo apt-get install nautilus was all I needed.
All fine now.
Cheers
@Andrew David Wong , maybe this should be a step in https://www.qubes-os.org/doc/template/debian/upgrade-8-to-9/