Cannot Open "Book title" It is formatted incorrectly, or is not a format that Apple Books can open.
Taking an original document (.doc, .pdf, .epub) and converting to .epub results in this error message.
Tested with http://libgen.rs in .epub and other formats, converted to .epub. Same result.
Documents appear fine in calibre. Other than rolling back OS to pre-Monterey, which is a PITA, has anyone cracked a solution?
Mac mini, macOS 12.2