Calibre makes it a point to remind users that it is a "Book Manager" not a "File Manager".
It can be the answer to this sort of issue. But there is the fact that most reading
programs, will have to construct their menus based on, no more than the file name and
any "Metadata" that it can find and read. Not all formats provide metadata that a
particular ebook reader can use. Not all formats provide metadata.
So, your eReader (app, software, or firmware) will often have just file names to work
with - along with any FILE management/structure that it can make use of. Which
introduces another major varable - the extent to which the device allows the user to
access the device's file handling system.
If the device allows you to define the file system's structure, allowing you to create
folders and sub-folders, there is still how the menu program treats those folders and
how it deals with file names. For example; Calibre takes advantage of how many
devices use a special character, in a file name, to mark the separation between the
"Title" and the "Author". Some eReaders will favor any metadata for that data, over
the file name.
Since we are in the "Android Devices" forum, and you list "Kindle" as your device I am
not sure how we can be of much help.
Luck;
Ken
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