I can't find anything about there being NO option to share a prison in the prison sharing tab. If I have a prison subscribed it is seen there, it just loads and checks for downloaded prisons and gives me the option to go to the workshop. Trying to get the achievement but can't upload anything if I can't find a place to do so. Everywhere I look, people are saying "go to extras, Prison Sharing" but after I unsubscribed from all downloaded prisons, it is empty aside form open workshop tab.
I just started playing not long ago so I don't know a lot about the game or anything about updates or bugs, thanks in advance.