Hello.
I've added e-book by this scenario:
1. E-book is quite big, therefore I uploaded it via FTP.
2. When adding e-book I specified relative URL in e-book URL field, i.e. /tradicija/biblioteka/knygos/my-book.pdf
3. Saved book.
It appears that link is dead - after clicking it in front-end I'm presented with error "File not found or inaccessible!".
That's ok - I managed to create correct link by specifying absolute link to PDF.
But the problem is that I can't delete the first, incorrect link - I select checkbox "Delete e-book", but after saving book it remains and is not removed. Additionaly, it can be seen that absolute link remained unchanged, while relative link was somehow changed to "components/com_booklibrary/ebooks//tradicija/biblioteka/e-knygos/Kuraitis_Ontologija_t_1_1931.pdf"
From this path I can understand that manually uploaded e-books should be placed in "components/com_booklibrary/ebooks/" and then it should work, but I think nevertheless it should be possible to remove wrong e-book link from the list.