same thing for me
my lawyer ask $750 from me after I got my AIP and send other doc for my 2nd stage. I paid him just in case to make sure I don’t do any mistakesAfter AIP my lawyer was asking 750$ just to fill 2 simple forms, and email additional documents; I said I will do it myself and I did.
But if you are submitting additional supporting documents and need to write and explain how it is related to your case; then you might need your lawyer as Ayanna said.
I remember when I was updating my file with additional supporting documents my lawyer wrote 3 to 4 pages of explaining additional documents.