The attachment was suppose to be available to everyone but since 3 attachments has never been supported it didn't work out. A guy in my gang called Suuk said he saw someone using the onback on ios so I had a play around with options and figured it out.
First I tried tapping random areas on my screen where the icon should be and then tried zooming in and out and found out that when zooming out for a secound I could see the icon in the top centre of the screen. I then tried tapping where I saw it, and zooming out and tapping at the same time. Finally I tried turning on options like joystick controls, enlarged controls and drag and finally the icon became visable and useable.
To put the ion on your back on ios, you
need either and ipad or mini, or a device that
allows zooming out to the 3rd zoom.
Turn on enlarged controls, equip ion and then zoom out all the way and the icon will appear. You can tap it and then zoom back in but you will need to zoom out again to tap the icon to take it off your back.
I will try to make it work for everyone, i'm assuming it has an incorrect x,y coord which is why it appears randomly and is only visible on pc because the screen size by default is larger and so can fit the icon in that weird spot.