I asked the member what he meant, and found out he was doing something I hadn't expected, but that used to work. He was simply uploading a bunch of photos, one at a time, but from the select photos screen, which saves him a step, and then adding the descriptions etc all at once.
Why would he want to do that? Often photos in my gallery are a series, and the descriptions are identical, or nearly so. For example it may be a bunch of train photos at the same location on the same date and only the train changes. So many of the fields I ask for, i.e. Date, Location, Railroad can be cut and pasted into multiple photos.
He can still do that, but now he can't change the categories.