link here, move here, copy here

[jschrot]

When I drag a file from windows explorer with the right mouse button onto a note in the UR-tree pane, a menu pops up with the options "link here", "move here", "copy here" and "cancel", but "link here"and "move here" are greyed out. Why? Is it not possible to link to files instead of copying or moving them? I seem to remember that I could link to files in previous versions of UR.