Chosen Solution
where does this part go? Can’t find out anywhere
It goes under the lightning assembly, bottom left, one screw hole to the housing and the other one to the dock, part of the cellular antenna, without that part signal will be weaker or very troubled. It seems that the SE guide used pictures from an iPhone 5 or 5S but you can see your part at step 32, but it’s missing the bottom metal shield in the picture: iPhone SE Front Facing Camera and Sensor Cable Replacement
