旅行代金の請求書の控えを2枚目に送った This に here, what does it mean.
Here's the context (The question doesn't appear in picture below)
There's a context saying 枚数: 本状を含めて2枚 ,so I think the bill has 2 pages.
I tried translating 旅行代金の請求書の控えを2枚目に送った and it was like " sent travel bill duplicate as the second page"
PS. In this post I use "Travel bill" as 旅行代金の請求書, Duplicate as 控え because I'm not good at English. Sorry for that.
Thank you in advance