Hello,
In fact, your question does not concern directly My Readings. It is rather a question of knowing how to name a file to import it in Calibre.
I have no absolute rule because, generally, I import my files with names which allow to fill partially metadatas and I complete them in Calibre.
Posts as this can bring an answer:
https://www.mobileread.com/forums/sho...d.php?t=119554