This should be easy for Jinke to fix. The Linux "ls" command ignores "dot" files by default, and I can't see any good reason for the EZ Readers to show these at all. No one is going to start the name of an actual ebook with "." and particularly not with "._".
Problem: Mac adds the file ._title.epub for Mac-specific metadata about title.epub.
Potential fix: hide the "._" files (i.e. don't list them as ebooks).
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