I want to write a helper function to send the link file (usually ebooks) under the point to Kindle path like (/run/media/username/Kindle/documents/). Hope this function can provide the following functionalities:- check whether the source file (ebook) exist in Kindle?- check the source file format, if not Kindle supported, then convert it with command `ebook-convert` which is comes from program "Calibre".I wander how to get the link actual path under the point?For example, org link like this:[[file:Data/Books/kk.epub][kk.epub]] [stardiviner] <Hack this world!> GPG key ID: 47C32433
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