Workflow to auto update annotated PDFs

Hi,

I use calibre with my iPad, and im wondering if there is a way to automate this workflow -

I often download a PDF/EPUB from calibre, use Kybook/Documents on my iPad to read and also highlight/annotate (particularly if its a PDF). I then save the annotated version back in my library, overwriting the original (I don't care about preserving the original).

Is there a way to get the auto-add feature to automatically recognize when I put in an annotated version of an existing book and overwrite it (or just add the new file to the original document)?

I know each book has a unique ID in the DB, so even a simple solution like - add the file to existing book if its named like "<id>.pdf" where <id> is the book ID would work well.