I know how to do it, but when I added a second tactic for some reason it deleted the thumbnail for first tactic. I tried to add the thumbnails back in game and re save them but I only ever had the option to update the new tactic.

After trying to re save both many times it would just instantly remove the thumbnail... I have completely lost update access to both formations and I cannot add a thumbnail!

Is there a way I can manually add the thumbnails.

Really frustrated by this.