I’m having the same issue. I uploaded 75 photos to a gallery, but four of them didn’t finish loading, so I had to add them separately. I have the gallery set to be ordered by image title, so I had them titled 1001, 1002, etc. I wanted to number these last four photos so that they would appear in order, but for some reason, I can’t edit their title. I can’t add/edit captions or titles, but can only click and drag the order. This doesn’t really work when I’m trying to take the last four photos on page four and put them on page one.
Maybe I’m missing a way to do this, but I’ve been trying to figure this out for quite some time.