End note; I'm in a few forums for all sorts of things from vehicles, computing and even laser engraving. Sometimes I ask for help but if it's my area of knowledge I'm happy to help others. On this occasion this forum came to my rescue. More specifically, tomcctv has been patient and sorted me out. I'm now getting exactly what I needed.
It's good to explain something of the solution to help anyone finding this in a search. I'm now using an android app, Explorer, and it's working really well. Create an account and add the device by serial number. And I've still got access on my local network using CMS to facilitate full access to the dvr.
Thanks everyone, and especially to Tom.