I might have the functionality wrong, as I expect the placeholder image to be replaced with the thumbnail image of the uploaded file. For example I would have expected the first page of the PDF to show as placeholder.
I am using the Default Template “Box – Box showing thumbnail, title, count, filename” and the free version (for now as I am testing)
Is there some code that needs to be changed? Or is there some setting in the “post” that needs to be set.