I realize this reply is almost a year after your post, but I have been experiencing problems with this and thought I would share my experience.
I have found (and Clarivate indicates on their EndNote support site) that uploading a Word document containing EndNote formatted citations and bibliography removes the Word field codes used by EndNote, and thus the citations and bibliography are no longer linked to an EndNote library.
The only workaround I have found for this is to keep the citations unformatted in the Word document, and format the bibliography in Word on your device when the document is finalized.
Clarivate says to save the document containing the citations in .rtf format; I have not found this necessary (i.e., .docx files can be saved as Google Docs files and downloaded as Word files when needed). I don't know if the symbol used to denote EndNote citations makes a difference; I use left and right braces { }, which seem to work OK as they are translated accurately between Word and Google Docs.
EndNote libraries can be stored in Google Drive; however, those of us who are Mac users need to save the library locally as 2 separate entities (.enl file and .Data folder) rather than as a package (.enlp).
I hope this helps you and other users, notwithstanding the long time since your query was posted.
- M. Kling
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