Ah, I see now what your issue is. First, the simple answer to your question. BB midi files are a single track of a type 1 file. They are not truly type 0 files, as they will NOT put individual instruments on separate tracks. More on this in a bit. Further, BB doesn’t care if the single track file was on channel 1,2,3 etc., down to 16 and including 10. It just needs a single track.
I opened your conga file in Logic Pro X to look at it and see what was going on. I had run into issues where various problems caused files to appear to not play, when they were, in fact, playing. Your conga file did not have that problem. Your file opened as 3 tracks, but I have had files ready for BB open as multiple tracks before with no issues, so I figured you had already dealt with that. My mistake. I then merged the three tracks to one track to save it as a midi file that will play in BB. That is the file I used, my conga 1 in the .sng, and it plays.
When BB files have what appear to be multiple tracks, i.e., bass, drums, and a keyboard and/or horn, etc., what they really have is the equivalent of a split keyboard. BB will only read a piano roll of up to 128 separate tones. So, for example, when I create a 4 part BB drum kit, I have the bass at 0 through 31, drums as low as 32 up through 59, keys starting at 60 going up to 96 more or less, and the rest, 97 through 127, for the horns. But, the octaves, except for the drums, are remapped, such that bass c1 through G3, is at midi c-2 through G0. The keyboard, mapped starting at C3, might have tones starting at c1 or C2, and the horns that start at C#5, are actually tones down around C#2, for example. The BB by itself would not be able to split instruments into different tracks. So, where a type 0 file might have both a piano and a trumpet playing C3, BB is only going to give that one sound, whatever is mapped at C3 in the kit.
Those of us that make songs for BB using the multiple part kits often start with Type 1 files. We then lower or raise the bass a couple octaves, depending upon how the kit is mapped, and then deal with re-mapping and editing keyboard parts and other parts to fit them into the 128 midi slots we have available. After we have all the parts edited into their little pieces of the 128 note midi range, we then merge the tracks into one track. Thus, it might appear to be a Type 0 file, but it is not. It is a single track of Type 1 file.