As The Royal Air Force would say: "Bingo!" IE you hit the target chaps (and Chapesses) Here in NZ we've just had a windows update. That inspired me to try one of the OneDrive Fixes.
So Stop OneDrive, Go to Add/Remove programmes and uninstall Onedrive.
Go to the MS OneDrive site and download the latest version. During the configuration/sign-in Process there appears (on one of the screens) a checkbox
"Get OneDrive Insider Preview Updates before the Release". I clicked that and immediately OneDrive started downloading. When the download and automatic install had completed, my problem was FIXED!
I can now move my local copy of OneDrive to my big internal disc and get it off the SSD (Which was WAY too small)
Brilliant work again; you would get that from the money grabbing, no social conscience team at A???e