I like to split my epubs into chapters before uploading them to LingQ. I create a course and add the chapters (lessons) to it. The problem: if the book has 30 chapters, I have to do this 30 times. It’s repetitive and tiring.
My Free Course Uploader extension might be able to help you.
Not possible at the moment, unfortunately, you need to add one at a time. We will see if that’s something we can work on in the future.