Word for ipad - cannot restore earlier version

I have the free version of Word installed on my iPad and this is linked to a Onedrive account. Until recently, I could select Restore from the pulldown menu in a Word document, then select View Version History On Line. This would open up a screen showing a list of all the earlier versions of the document, and it was then possible to open one of these versions. Now, all I get is a number of screens flashing up and ending with a view of the latest version of the document with a sign at the top saying "return to Word". There is no list of the earlier versions.

I do not know if the problem is with Word, Onedrive or my iPad. It feels like it is some setting that has changed - any suggestions would be welcomed.