Tip: long press the image you want to save, tap Save.
I am pretty sure that was one of the first things I tried and nothing happened. Just tried on my iPhone X and the long pressed showed that menu, is there any difference there between models, he has like a 6 or 7?
Either way long press has the same non discoverability issue especially for not techie people who are used to it working a certain way before.
I immediately thought no way they would remove that he must be mistaken, I just upgraded too and hand't tried to do that action. Looked at his phone and sure enough it was gone, tried all sorts of things finally Googled it and oh wow you got to be kidding me scroll down but no indicator you can, that's bad, there is going to be a lot of confused people, why would they do that?