No PDF metadata available or extracted from a PDF file at URL when trying to obtain automatic cite reference?
So the user must fall back to manual filling in the cite template (manual copy/paste).
It succeeds for e.g. a PDF prepared from PowerPoint presentation that was uploaded to Commons.
Maybe it depends on the metadata (not) available in the PDF file itself.
Would there be some recommendations on how to structure the metadata in a PDF file, or (broader) on any web HTML page?