Quick Copy
From the documentation:
"Simply select items in the center column and drag them into any text field. Zotero will automatically create a formatted bibliography for you."
That works.
"To copy citations instead of references, hold down Shift at the start of the drag."
That does not work. A null mouse pointer appears and nothing gets inserted.
This is with Zotero 4.0.28, LibreOffice 5.005 with the plugin successfully installed.
"Simply select items in the center column and drag them into any text field. Zotero will automatically create a formatted bibliography for you."
That works.
"To copy citations instead of references, hold down Shift at the start of the drag."
That does not work. A null mouse pointer appears and nothing gets inserted.
This is with Zotero 4.0.28, LibreOffice 5.005 with the plugin successfully installed.
(also note that quick copy isn't equivalent to using the LibreOffice add-on, in case that wasn't clear. Zotero will not "remember" citations inserted via quick copy to later create bibliographies)
Have you tried changing the default style in the Export tab of the preferences?
We'd want a debug ID for an attempt to shift+drag:
https://www.zotero.org/support/debug_output
Now, both bibliography and citation work when dragging to, say, this text box in Firefox. The menu option "Edit-Copy Citation" also works. The keystrokes you specified work as well.
Next I updated LibreOffice to latest version 5.0.1.2, just to be sure.
The menu option "Edit-Copy Citation" and the hotkey works fine for inserting a citation. Shift-click-and-drag still does not work. Which is fine for me, since I have can use the menu shortcut, which I did not know before.