Issue with Imagemagick not producing thumbnails from PDFs

So - tracked this down to a restriction in ImageMagick’s policy.xml file.

See this post over in the Omeka S forum for the solution.

Apparently it’s recommended to upgrade ImageMagick above 7.0.1-2 to plug the security concern the policy limit was implemented for: https://stackoverflow.com/a/52715220

I’m running ImageMagick 7.0.8-24. Thumbnails are looking good.