Cannot install “book title”, not enough storage - but I have more than enough storage

This is a book I’d previously downloaded and read on iBooks, and now I want to reread but when I click on it it’s not able to “install” due to “not enough storage”. Even though I have more than twice the storage needed, I still cleared a bunch of things to open up space. I also rebooted my phone a couple times but nothing seems to work. What can I do?