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.