Hi again – so, the thumbnail tray worked perfectly, thanks.
The only issue now (I’m so close!) is when I try to move the thumbnail tray from the bottom to the centre of the page (like ‘top: 40%;’ for example). For some reason it loses the ability to be clicked, as if it were an unlinked image or something. Is this something you’ve heard of before?
Great, I’ll try that – hadn’t thought of using it. Thanks.