Common application counselor fee waiver question

Hello,
I was watching the common app’s video of recommendation letters and I saw that once you invite your counselor and he accepts there is a “fee waiver” tab that is “not started”. Now, I applied for fee waivers when I made my common app account but I couldn’t find anywhere what exactly does the counselor have to do in that tab, and I’d like to know if it is simply a signature of confirmation that I require a waiver or if he must submit any official documents to prove it? I am going tomorrow during class to add him as my counselor and I’d like to know if I need any additional documents to bring with me.