How did this not get asked before? Lol
I am not sure if this was a feature here before but a while back you were able to undo your flags a short period after you do it. Not sure if it was a plugin on our end but I see no reason for it to be a plugin. I sometimes go to flag a post and accidentally choose the wrong option. Now moderators will not accept the flag because the reason is wrong. Is there still a way to undo it then? Or should I make a feature request??