Overseas 

If you fill out I-129F while overseas, is it possible to submit it to the proper authorities? I am confused as the state.gov website states that we may not file it at USCIS or embassy while abroad. And when sending the proper forms (that require a "filing fee") do we send by cash, check or what? I've also noticed that the amounts supposed to be paid tend to vary from page to page, is this a tech issue or are they separate payments? 112.81.1.97