H1 revalidate问题请教

1. 我和老公都是H1, 都要做revalidate, 那我们的材料中要包括对方的材料吗? 网站上有这一条:

If the spouse and/or dependent children are applying for visas separately from the principal alien, submit certified copies of the principal alien’s valid visa and valid I-94 (front and back) in addition to the other listed requirements.

2. 请问大家都是怎么寄的?用邮局还是Fedex还是什么?回函信封是怎么准备的? 网上说:

Please use your address as the “from” address on the airbill or the self-addressed envelope

这不是寄回给我的吗, 为什么是"from"?

多谢啦.