Thanks @mawa actually it’s not fixed as on mobile:
a) the scroll of the scrollViewer does not work so
b) once that’s working then the panning (moving in Y axis?) will need to be avoided (that’s triggered for the camera when you use two fingers to move up/down) and
c) if the pinch zoom was somehow to be used to do something to control the scrollViewer on mobile (though I don’t know what that would be) then these events would also need to be disabled somehow.
Sorry this is a bit messier than I’d like it to be so I’m happy to provide any clarifications and I welcome any suggestions! 