I have a MAC and use Google Documents. I have been trying to use Zotero for my citations all week and it is not working. I have reloaded, tried to add the extension again and nothing. HELP!
There've been ongoing problems due to some Google Docs changes that Google is testing with a small number of users. The latest fixes are available in Zotero Connector 5.0.119. Whether that's available for you depends on the browser you're using:
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https://forums.zotero.org/discussion/comment/456294/#Comment_456294