iPad 9.7" 5th Gen. (2017 model) | iPadOS 13.6.1
I have a lot of PDFs stored in Books. I have set up syncing to iCloud (or at least I think I have), such that every time I add a book I see a brief notification which says that the file is being synced. Also, the space in my iCloud drive decreases correspondingly. However when I log into icloud.com and click on Drive, it's empty. This is the only content for which I have used iCloud, so there's nothing else there that takes up space. Could someone please tell me how to locate my files on iCloud?