Each UBook requires the following:
It can also include these optional files:
All the files are added to a folder which is zipped. The resulting zip file is the UBook file.
Create a folder and name it this way: Author Name – Name of Book e.g. George Orwell – Animal Farm.
Put the files inside then zip it using a compression tool. This should create a file like George Orwell – Animal Farm.zip.
Rename the file extension to ubook e.g. George Orwell – Animal Farm.ubook.