US Immigration from United Arab Emirates

I'm really struggling and need some guidance:

1) How to get documents to 2MB to upload at the NVC stage? I've compressed my tax return multiple times and it's still 2.4MB and gets rejected when I try to upload it.

2) How do you edit the entire I-864? There are certain sections where I can't type, even after downloading. Do I just write that part in pen?

3) After everything is submitted to the NVC, how long does it take them to review the documents?

Thanks!

I am filling out I-864. I live overseas and work overseas and get paid in local currency. For my annual income, should I put zero? Should I put zero for my spouse too even though he contributes to the household? Thanks!

I make a mistake in my ds260 form I added only my 5 years travel history and physical addresses idk how to add the remaining addresses to my ds260 now as it already submitted or how to solve this issue is there a way to solve out this problem?

25 August is covered Interview date 12 June 2023

Hi everyone. I'm petitioning my parents (or maybe my dad first). Once dad is here, I understand he can then petition for my underage brother (age: 14 y.o.). What happens if my parents decide to abandon their green card in the future? will my brother keep his LPR or will he lose it? thanks!