Retain posts on Advocacy Board once an Advocate shares a post
When an advocate shares a post, rather than the post being removed from the board, they can select to retain it for future posting.
The use case wouldn't be for every post to be retainable,
The admin at the point in time they create the post and add to the board, they can define if the Advocates are able to retain the post once shared by the Advocate.
Many posts are repeatable over a period of time and leaving them on the board would be a helpful feature.