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I don’t manage in a good setting the puzzle, However the model 3D sunglass appear in good design before AR.
Why the sunglass don’t sticky to the arrow ?
I tested your link. Difficult to say why it happens. It might be that the origins are not in the center of model, or hierarchy is not right. I recommend to open the AR demo in blender 2.80 and reproduce the hierarchy in Blender 2.79.