Blank thumbnails, no pdf shown on pdf page

QuestionsCategory: PDF Light ViewerBlank thumbnails, no pdf shown on pdf page
Avatardavor asked 12 months ago

displaying thumbs like:
[pdf-light-viewer-archive title=”” categories=”cat1,cat2,cat3″ posts_per_page=””]
some thumbnails are blank
when clicking on thumbnail, page shows title correctly but no pdf is shown, error console shows no error
is there a step by step working tutorial for creating categories with thumbnails like in this example: are blank thumbnails also at example page, how to replace with custom image)