linux, can't add a book from my FBreader library via my gdrive connection

[promeneur]

opensuse leap 15.2 fbreader 0.99.4

I try to add a book using the file selector which opens when i click on '+'.

The file selector is kde dolphin file selector.

I select the connection Gdrive gdrive:// then i go to my library gdrive://FBReader® book network/ then i select a book then i see a progress bar 10 % then the progress bar disappears then i click on 'open' then the file selector closes then fbreader displays the list of books. It is empty.