  In [J14], a conjecture was proposed on a relation between the global Arthur
parameters and the structure of Fourier coefficients of the automorphic
representations in the corresponding global Arthur packets. In this paper, we
discuss the recent progress on this conjecture and certain problems which lead
to better understanding of Fourier coefficients of automorphic forms. At the
end, we extend a useful technical lemma to a few versions, which are more
convenient for future applications.
