I don't remember. It was many years ago -- circa 2015. Nevertheless, I'm irritated by the implication that it's the user's responsibility to do this.

At least as recently as last year, I've discovered instances where iPhone users will not have received a message/image (both from me and others in group chat) seemingly randomly.

I really don't like that Apple has managed to sell a prevailing narrative that it's somehow the fault of users who don't buy their expensive hardware that is necessary to use their software that impinges on an open protocol.