Lumia 950. Haven't had update problems for many versions ago.
However, Photos, which has always been something of an "under construction" mess, and its development seem to have been handed over to the "1 Hour Photo" group! Getting everything uploaded to OneDrive, doing sync stuff and more (presumable) takes precedent over Photos actually making images available to view on the phone, as in up to an hour or so wait! And, STILL, something as basic, and abjectly sensible, as renaming photos in Photos is non-existent.
MS seems to be reinventing the wheel with Photos, and wanting to be clever, decided to make it square and now is figuring out how to make it roll.