because MIDI files may contain more than one track or channel and that would clash with an already existing MIDI track which stands for one and only specific MIDI channel, always.
you can drop a MIDI file into the Files window pane and after that expanding it for you to see all the channels (SMF Format 0) or tracks (SMF Format 1) in there: only these may be food for new MIDI clips, not the whole file; from there you may then drag-n-drop over the main canvas and place a new MIDI clip anywhere, as long it's a MIDI track...
when dropping onto the empty area, a MIDI file will unfold into as many tracks as there are channels (format 0) or tracks (format 1); when dragging from the leaves of the Files tree window, it will only open one single MIDI Clip if on an existing MIDI Track or on one MIDI Track that is created automagically if dropped into the void zone).
because MIDI files may contain more than one track or channel and that would clash with an already existing MIDI track which stands for one and only specific MIDI channel, always.
you can drop a MIDI file into the Files window pane and after that expanding it for you to see all the channels (SMF Format 0) or tracks (SMF Format 1) in there: only these may be food for new MIDI clips, not the whole file; from there you may then drag-n-drop over the main canvas and place a new MIDI clip anywhere, as long it's a MIDI track...
when dropping onto the empty area, a MIDI file will unfold into as many tracks as there are channels (format 0) or tracks (format 1); when dragging from the leaves of the Files tree window, it will only open one single MIDI Clip if on an existing MIDI Track or on one MIDI Track that is created automagically if dropped into the void zone).
all's working as designed long time ago :)
hth.
cheers