Option to return to built-in PDF reader does not appear.

Hi, I am using Zotero in Spanish.
A few days ago, in the general preferences, I changed the PDF reader to "Predeterminados del sistema" (System Default). I want to go back to using Zotero's built-in PDF reader, but the drop-down list does not show the "Zotero" option. How can I reset the PDF reader to the built-in one. The "custom" option appears, but I don't know if I should look for an executable.

https://i.postimg.cc/13s395VT/Anotaci-n-2022-06-07-172406.png
  • Hmm, weird. Can you provide a Report ID?

    If you go to the Advanced pane of the preferences and click on Config Editor, what's the value of extensions.zotero.fileHandler.pdf?
  • Hello, Thank you for the very prompt response.
    Report ID: 1474402288

    "extensions.zotero.fileHandler.pdf" is empty

    https://i.postimg.cc/br6fppXX/Anotaci-n-2022-06-07-1724062.png
  • Oh, you're running Zotero 5. The PDF reader was introduced in Zotero 6.
  • But I swear with the same version I was using the built-in reader a few days ago. anything to do with this version 5?
  • edited June 7, 2022
    You're misremembering. The PDF reader literally did not exist in Zotero 5, and you can't open a Zotero database that was opened in Zotero 6 in Zotero 5. So you were either not using the built-in reader or you were using Zotero 6 with a different database.

    You can upgrade to Zotero 6 via Help → Check for Updates.
  • Thank you again. You were very kind
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