EDIT: I found the main thread about this topic and posted there: https://premium.wpmudev.org/forums/topic/updating-multisite-content-copier-created-content#post-1237649
This can be marked as a duplicate of that.
I have seen several posts from 2013, 2015, etc that all talk about adding the ability to edit or override content shared with the plugin. As in, you create a post, copy it with the plugin to another site, edit the post, then can tell the plugin to override/edit any existing post on the destination site. Currently the plugin just makes a duplicate. Here's on of those threads:
What I'd like to know is if there's any kind of timeline or update or place I could go to follow progress if this will ever become a feature.