I am using a 3rd party coverflow plugin.
I need to add data-thumbnail-path as a custom attribute, referencing a thumbnail.
At present this is fine as I can just add a URL to a image on the site.
Ideally though I would like to reference a image uploaded to the project.
Yep I worked that out - not long after I posted - it was only a workaround anyway. At the moment I have a more “serious” issue in that Chrome does not seem to allow “Unsafe” scripts anymore.