I had the same problem (Midi File Type 1 with all channels in one track), and based on the discussion I did something I thought would be too simple, but it worked ...
I "Saved As" the file as Midi Type 0 and closed it. Then I Open-File the Type 0 file and it was opened with each channel on its own track.
How to import MIDI separating by channel
in Cakewalk by BandLab
Posted · Edited by Dan Vanevic
I had the same problem (Midi File Type 1 with all channels in one track), and based on the discussion I did something I thought would be too simple, but it worked ...
I "Saved As" the file as Midi Type 0 and closed it. Then I Open-File the Type 0 file and it was opened with each channel on its own track.
Repeating myself, simple but it worked.