Attachmovie & external movies

Is it possible to attach movieclips that are in the main movie from an externally loaded movie.

There is a main movie and a sub movie
The sub one is laoded into the main one

In the sub one I have “attachMovie(“amovieclip”);”
and the movieclip with a linkage “amovieclip” is in the library of the main movie not the loaded one…
Should this be working?

(I kinda tried it but no worky… I wonder if it’s not supposed to be working or did I just miss something)