?? Calibre does not care what the source folder name is.
ADD BOOKS (icon) reads the book info and MAKES the needed Library folders while making the DB entries.
No available formats indicates that what you are trying to do can not find a format that can be used for that task.
Preferences: Behavior: Preferred Output format sets the default Conversion OUTPUT. (AZW3 for a modern Kindle)
If you open the Metadata Editor (on a problem book), What formats are present at the right?
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