There's a crosspost button at the top of posts, it looks like a copy.
Lemmy
Everything about Lemmy; bugs, gripes, praises, and advocacy.
For discussion about the lemmy.ml instance, go to !meta@lemmy.ml.
expired
Correct, its not on jerboa yet....
Crossposts already exist, there's a button for it. For example, I just crossposted this post so now it shows up with a little cross-posted to: World News
and my cross-post on World News also shows a little cross-posted to: environment@beehaw.org
I would love to see this as well. It's definitely a challenging topic as crossposts can happen across instances, but I think it would greatly improve the discoverability of content and new communities.
As people have answered, it already exists, but not every client has support.
Edit: how tf did you get downvoted in 8h on a dead post??? 😧
Depending on exactly what you have in mind as a cross-post feature, there is this button on posts to cross-post: (also I see other folks have answered this, but seems like the replies didn't arrive over here on my derpy instance)