I searched for iPad air 2. the pictures here are different to the insides of mine so it is quite a bit more complicated. Maybe because mine is cellular as well?

Yes, and now mine doesn’t work, not sure why as the reconnection seems ok.

I accidentally cut the volume cable as when I tried to gently pry that corner area with the iFixit triangular plastic openers, one needed to be pushed quite hard to open the screen and slipped, the cable was stuck to both the screen digitiser glue and the case, so when I pried the screen off, the cable tore. iPad still works but annoying the glue is so strong.