Red cross

Sometimes, the zotero icon is a pdf icon, so the pdf file seems available, but when I click on it, it changes to a red cross. Does anyone know how to solve this?

E.g. when I want to add the pdf to zotero from this website:
https://jeugdmonitor.cbs.nl/sites/default/files/2019-01/J-186109 C.pdf
  • edited November 4, 2020
    That would generally happen if 1) you're using Firefox (which prevents us from displaying a proper popup or error when viewing a PDF directly) and 2) Zotero is closed. If you hover over the icon, it should say more.
  • Ah, that helps a lot! Thanks!
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