What I’ve always wondered is what the issue is with using essentially any gallery service (or even a cloud drive with semi-public links for this) and just send that link to those people via their email address. Why would I need to use a service like Facebook for that?

Additionally, I’ve never grasped what those Facebook features supposedly used for private communication elevate them over simple email use in general. I’ve found them more cumbersome to deal with than email, to be honest.