There appears to be a documentary on this topic.
Here is part 1,
THE COOPERATION OF MACEDONIANS AND ALBANIANS FROM 1850 TO 1940:
https://www.youtube.com/watch?v=PJa9ECGqHvM
And here is part 2:
https://www.youtube.com/watch?v=Eu5NEFHgUSw
It's in Macedonian, no English subtitles. I just came across this so I haven't had the opportunity to watch it yet.