The Zotero toolbar can also be used in Google Docs, making it easier to collaborate. It is part of the Zotero Firefox, Chrome, Edge and Safari connectors. A toolbar and a Zotero button are added to Google Docs and can be used to add citations and a bibliography, just like in Word or LibreOffice.
Zotero recommends that multiple people do not add or edit citations at the same time. If you want to start writing a document in Google Docs and then move it to Word or LibreOffice for final editing, you can do so while maintaining active Zotero citations. Simply select "Switch Word Processors" from the Zotero menu in the Google Docs toolbar, save the converted file, and open it in Word or LibreOffice. The process should be reversible, but Zotero recommends performing the conversion in a copy of the file.