How to automatically update citations in overleaf every time I add a reference to zotero

Hi, as we know that we can export a .bib file from zotero and upload it to overleaf project and use it for citations. The problem with this is that new references added to zotero will not be among the downloaded .bib file, so can't be used for citations unless redownload and reupload a new .bib file.
I found a YouTube video that shows that creating a private key in zotero and using collection ID and user ID, I can generate a URL. And then in overleaf project, under upload, I can select 'From external URL' and paste this URL there and create a reference file name. By doing so, every time I add a reference to zotero, this reference file will automatically generate citation for this new reference.
The problem that I am facing is that once I past the URL, overleaf shows an error saying: "Your URL could not be reached (500 status code). Please check it and try again". --- Does anyone know why is this happening and what's the solution? Or is there another way to link zotero and overleaf so that even new reference added to zotero will automatically generate citations in .bib file in overleaf? Some feedbacks will be much appreciated...
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