Exporting and importing painted textures to another file

I’ve been trying to import two of my characters in a scene together. The biggest I have is the when I import the model into the file with my other character, everything goes to shit. My hand painted textures are either completely pink or seen on the picture, glitched. Not only that, but the bones somehow subdivided and don’t move with my original IK rig. The eye materials are also gone. :confused: I don’t know what’s going on and I’ve watched some videos on it but nothing has really helped me so far.