How To Annotate PDF Online?
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Is there a way to save Mendeley annotations to the document itself without having to export the PDF with annotations?
Mendeley doesn't currently monitor file attachments for changes and upload them automatically, so if you annotate a PDF in a tool which embeds the annotations in the PDF, t won't be uploaded automatically. You'd need to remove and re-attach the file in Mendeley to get it to pick up changes. Annotations created in Mendeley itself are stored and synced separately from the PDF and are linked with your Mendeley account.
Annotate PDF: All You Need to Know
If you save multiple versions of a file in an editable way (you can save as a PDF, as an pub, as a Mobipocket, etc.), t will choose the best version based on the file's content and the document's metadata.