OnePlus 6 rooting issue


I’m having an issue at the stage of rooting my OnePlus 6 @ minute 6:51 on “How to root OnePlus 6” video.

When I go to drag the three files onto my OnePlus 6 (connected to the PC) it’s not mounted for some reason? My PC doesn’t recognise a device is connected?

I also have a Macbook, to test it out and it doesn’t recognise a device is connected either.

Is there a way to proceed or possibly reverse what’s been done?