Sorry, something went wrong with Diigo extension earlier. Issue has been resolved a few hours ago. Please try again. Our sincere apologies for the troubles and concerns caused.
Or save a page then open it in library to organize with outliner in split view. The problem seemed to be caused by a bug of Chrome and we have reported the issue to Chrome. Currently waiting for the update.
There's an issue with dragging text from a web page into an outliner in the sidebar in Chrome Version 71.0.3578.98. We're looking into this issue. Please try using Diigo extension on Firefox for now.
@theodorosc Please try again. If problem persists for you, send us a message via the feedback button in your library so that we can look into it. Thanks.