Thank you Omnimaxus. there is also the thread we had on Expandrive here where I had just posted the same thing.
I had just recently reinstalled Zorin onto its own drive rather than a dual boot. I havw not yet attempted to install Expandrive as I have no current need for it.
I've migrated all my use of cloud services onto my own nextcloud instance on a server under my control. There is a nextcloud desktop app for both windows and Linux which meets my needs.