Hi
Sorry for my English - it's not mine natural language
I've spotted something strange when try to add another format of a book already in the Calibre. If I copy a new format of a ebook , for example txt, in the same folder where original ebook is, and add it to right ebook , after I press OK, size of a new format is 0. Calibre erases content of a new file , and lives only a file name.
Best regards