So now max exports without an error, but random textures and parts of the turret are missing when I look at animations in OE.
For example, in max the idle_1 animation looks ok, but when I look at it in OE the turret is missing.
Edit: Ok so the model shows ingame now but without animation. I think its because the ref and animation files don't have the same mesh but I still don't how to add the new model to old animations.
If you add new meshes,without adding them in a vis file(without the forcenvisible=yes),then they will be registered as invisible when exporting by default.
Always do that when adding new meshes to the ref.
Said vis file(example,vis_master)should be attached in OE in a motion that is attached to all sub-actions(like default or melee_attack),to allow the emshes to be visible in-game.