@MalixaliThank you for your kind words I'm glad this thread can help members I started this thread to help in this painful immigration journey and everyone doing well helping please keep up the good work π now answers to your questions yes you have to upload Updated i-864 forms ,and joint sponsor tax return your spouse tax return W2,paystubs and whatever updated documents but make it ready and as soon as u get IL upload then and make all the copies of original documents which are uploaded and take it on interview there is no need to write letter to inform about new joint sponsor they'll see on updated AOS and ask the questions in interview u can then explain. This is what I believe if someone else knows differently please share.