Two other thoughts.

Band-in-a-Box, BiaB, handles opening a file and importing a file differently. If one way is not working for you try the other way.

If the midi data resides on the Melody track you can navigate to Melody > Sequencer Window for Multi-Channel Melody. The sequencer will divide the data by channel.

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Melody > Sequencer Window ...

Jim Fogle - 2025 BiaB (Build 1128) RB (Build 5) - Ultra+ PAK
DAWs: Cakewalk Sonar - Standalone: Zoom MRS-8
Laptop: i3 Win 10, 8GB ram 500GB HDD
Desktop: i7 Win 11, 12GB ram 256GB SSD, 4 TB HDD
Music at: https://fogle622.wix.com/fogle622-audio-home