It is possible to add multiple files from one format to the book in the Calibre library?
Let's say I have the book in all major formats, but for example in PDF format, I have two versions of this book that I want to keep. No matter what, there are different causes and there are many books ..
How this can be done as a standard way I can do that. When you add a second file of the same format, it replaces the one that was already there.