Books don't appear in library

I'm using the ADE app on a Samsung phone. After the recent update to marshmallow version 6.0.1 none of my books are working. I do all the same simple steps to download, but the book doesn't show up in my library. I see it in my downloads, but I can't get it into ADE.

I've done every thing I can find in the forums and nothing works.

Any ideas?