How to receive file from Postman or Next.js with POST method

I want to send a file as image or pdf. While I am using Postman, I make POST method and body type is form-data. Liike this screenshot:

enter image description here. But I can’t receive any body in Express. My Node.js code is like:

enter image description here

And output is like that:

enter image description here

I tried multer and multipart libraries, but it doesn’t work.
How can I solve this problem?