Reference in the text but not appeared as footnote
I try to add citation in a text, the reference appears correctly in the text, but it can't appear in the footnote column, and when I want to modify Word Document preference, the selection 'Display citation as footnote or endnote' is in gray scale color, which means that this could not be changed. Is there anything wrong with my Zotero or Word plug-in configuration?
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As adamsmith says, a numeric style will not show anything but a number in the main text -- it's not a footnote number, but the number of an item in the bibliography. If you want a different style, select a different style via Document Preferences.
(Smith 1776) for ASA, (Smith) for MLA. Again, you'll get the full reference in the bibliography. That's the only format these styles exist in both in Zotero and in the respective style guides.