are you working from you multi cam master?
you may need to duplicate that in the project panel…(rename it appended with flat)
and then use the duped version and “flatten” the multi cam ….
this will lift everything from the nest sequences to the reference the original source material…
(hence why you want to be working in s duplicate when you do this)
I’m gonna guess that PPro isn’t gonna be able to export the AAF with the nested multi-cam clips as it probably won’t trace down to the source media…
Alex Udell
Editing, Motion Graphics, and Visual FX