Hi I was having the same trouble. I had the plugin “Attachment Pages Redirect” installed. It works again if I deactivate that plugin and then re- copy-paste the URLs into the VR shortcode.
I wish they could work together because attachment pages are annoying for my regular 2D images! I’ll have to live with it for now until I can spend the time to learn how to customize my attachment pages instead of disabling them. :/
I’m an architecture student making an academic webpage and the VR display is really the central reason for making the website in the first place. Thank you for this plugin, I would be lost without it!