International students need to mail financial documents?

I am an international student and when I emailed the scanned financial documents to admission officer, he/she forwarded to the financial officer. Later on the FO emailed that I should mail the documents via post. Did they ask for you too? I am asking because it just feels different that they are asking for physical copy for international students even before admission.

Thanks in advance.

They asked me to mail it to them which was weird since I didn’t have the total amount. But I sent it that way!

Just sent it through scan, i think they are asking too much, mailing it by post would be expensive.
P/s: do yout take the toefl or ielts?

@Quanh261997 yes it is expensive and I took TOEFL test too…