Syncing new device, what am I doing wrong?

I have 1.0.167 on my Win 10 PC syncing to WebDAV - it has always worked like a dream.

This week I installed the iPad app (10.0.37) and managed to configure the same WebDAV folder successfully (no errors)

When the iPad app syncs, none of the notes in WebDAV appear. Neither do I get any errors.

However, on the PC I still have all my notes and they continue to sync with success.

Can anyone recommend some troubleshooting that I can carry out to understand what I am doing wrong here?