Weird sync between DTP and DTTG: any fix?

So I go there

it explains to me how to set up my Nas / Webdav. I’ve got that.

But then what? Looking at my ipad, I see the database I’ve set up ages ago, probably 10GB in it, but no obvious way to even show / modify the webdav settings.

The only option I’m having is to delete it, which I’m doing at the moment.

I don’t know, when synchronizing on the iPad, all it shows is a minuscule cloud icon which is perhaps meant to fill up - but really no actual way to see what it is doing.