Hi,
actually we can add book via menu' in this way:
1) One folder, each file is a different book
2) Multiple folders, one book in each folder
3) Multiple folders, different books in each folder
4) Via zip/rar archive.
I ask you 2 more options based on the same concept:
- One folder, consider files with the same name (and different extension) as one book
- Multiple folders, consider files with the same name (and different extension) as one book