"Extract Annotations" was a feature of the third-party ZotFile plugin.188BET靠谱吗In Zotero 6, that feature has been replaced by Zotero's own advanced PDF functionality.

You can create a note from all of an item's annotations by right-clicking an item in the items list and selecting "Add Note from Annotations", or you can open the PDF in the new built-in PDF reader and add annotations selectively.SeeAdding Annotations to Notes188BET靠谱吗for more on the various ways of using annotations in notes in Zotero 6.

For more details on the new functionality, see the188BET靠谱吗Zotero 6 announcement.