Hi @Miki I believe your question relates to this thread which is an increasingly popular topic Importing MIDI into Scaler 3 while keeping rhythm/timing of the chords - #12 by Tristan
Currently importing a MIDI file into Scaler 3 treats it as a detection source, whereby detected chords appear on the main track, and detected scales are listed. The result is the same whether it is a single or multitrack MIDI file. As you mention, detection is being greatly expanded upon in a coming update.