In the quiz above, there was a question about the sentence:
Après manger, les filles feront leurs devoirs
I was slightly confused as I would have written this sentences as "apres avoir mange" (with appropriate accents) at the beginning and not apres manger. In this lesson it seems to imply that to write apres+infinitive is wrong: Après avoir fait = After doing in French (auxiliary avoir)
I think I may be missing something and would appreciate some help. Is manger being used as a noun here maybe?