You need to first add bibliographic metadata to the pdf by right-clicking and choosing Retrieve Metadata for PDF or, better, importing the item from the publisher website using the Zotero browser Connector.
In general, you always want to be working with regular Zotero items with metadata, not raw PDF files, as that opens up most of Zotero’s features (sorting, searching, citing, etc.).
Tks!
In general, you always want to be working with regular Zotero items with metadata, not raw PDF files, as that opens up most of Zotero’s features (sorting, searching, citing, etc.).
See here for an introduction:
https://www.zotero.org/support/getting_stuff_into_your_library