Broken pin on motherboard

Hi, New to fixing phones, only my 4th. I thought I carefully stripped my phone to replace the camera module, but I had a small pin drop off when I removed the main board. See pic below.

2 options I've had say you can either glue it at the edge to remake contact, and another saying they are not crucial to the phone operating, so leave it off.

Welcome some advice on what's best.

Thanks for any help.

Thanks, I'll try that first and test.

I've tried to find schematics online,but not much joy.

No I think he meant glue. I've taken some better pics, as you can see on the part itself, the entire base of it is covered with a red paste/glue. No metal part is exposed where it was bonded to the board. No solder etc. And its sprung between the board and the screen.

And a closer pic of the board.