V89

Hello! First, sorry for my bad english, i hope what i write is clear. I want to make custom companion portraits. i have seen these are in data folder, but they dont work, i have with "UnityAssetsViewerx64" edited the assetts, works fine in the game, but at the end fails ... When i save the game and load it again, i see the old companion portraits, what do make i wrong? I dont cant understand that ... can anyone help me please ... Greetzzz V89