Ribbon cable orientation Copper up or Down?

Hi I Replaced the upper and lower screens of my 3DS XL 2015 however after 16 Hours working on this I managed to forget what the orientation of the Cables should be (Speacker cable Screen Cables and the 3D Camera Cable. The Tear down will not give an Idea and I also searched YouTube the only detail videos the guys fingers cover that specific section. so I would be grateful if somebody has a clear answer