Drag-and-Drop is not working.

The only currently known VST bridge which supports drag and drop is Yabridge.

If you are using a different VST bridge, there is a workaround. The plugin is creating a temporary MIDI file on your drive in the "Documents" folder on every attempt of a drag and drop action, even if it is not supported by the DAW or by the system. This workaround makes use of this temporary MIDI file. The following video shows how to do it.