You take a photograph worth showing to both sides of the family. Without something like this, you post it twice and then read two near-identical conversations, replying to the same question in both.
The Keepr Chain is the fix.
One post, several circles, one conversation#
Post once, choose the circles, and everyone sees it — with the likes and comments pooled. Your mother's comment and your brother-in-law's reply sit in the same thread, and you read it once.
The copying part is the obvious half. The conversation part is the half that actually saves you something.
Or keep them separate#
You can turn the Chain off and post to the same circles with separate conversations. Each circle then sees only its own comments.
That's the right choice when the groups shouldn't see each other. Close family and work friends may both get the holiday photos without either wanting the other's commentary attached.
This is a privacy control, not a formatting preference. Deciding whether two groups of people can read each other is worth a moment's thought rather than accepting whatever was set last time.
When the option appears#
When the album you're posting from is already shared with more than one circle. With a single circle there's nothing to chain, so it isn't offered.
If you expected it and it isn't there, the album probably reaches only one circle — see Circles.
What it isn't#
It doesn't copy photos into several albums or use extra storage. There's one post and one set of photos; the Chain is about who sees it and where the conversation happens.
It also doesn't merge the circles themselves. They stay separate groups with separate membership — the only thing shared is this post's conversation.