Place the webcam cable back in its routing channel, laying it over the display cable and letting it go through the same clips.

When the webcam cable meets the adhesive stripe of the display cable, let the former go behind the latter so that later, once you will be attaching this adhesive stripe over the fan, it will hold also the webcam cable in position.

Once the webcam cable is correctly positioned, grab its end as shown in pic#2 and push it inside its ribbon connector resolutely, with one single movement.