[JP] Harry Potter combined drm free ebook (1-7) doesn't import
I assumed this was a file size problem and started using smaller epubs.
Yeah I couldn't import Harry Potter either. I had copy and paste each book into its own txt file and then import that instead.
I have encountered this as well, I ultimately split the books apart after converting to a txt file in Calibre.
it should work, but you can always try to convert to different format etc with calibre