KMail to Dolphin drag-and-drop broken

[Borden <borden_c@tutanota.com>]

In the past couple of weeks, I notice that I can no save email in Dolphin folder by dragging them from KMail. Now when I try to do it, all I get is an option to create a link, whereas I used to have options to copy, move and link.

This drag-and-drop functionality is a bit critical to  my workflow, so if there's a way I can reconfigure it back, that would be great. I'm asking here because I didn't find anyone complaining of the same problem on the Internet.

With thanks,