While you do not have to it can be very important to send them more than they need at this stage. Here people will call it frontloading. Phone bills, pictures, e-mails. letters, copy of skype pages. You do not have to send all , just examples from each month is what i did to show ongoing relationship over time. It is not needed now but can be VERY helpfull to have it in your file when it goes to the consulate.
d&z got a reaction from TBoneTX in Proof on an ongoing relationship sent with the I-129F Package?