I use next config to save files on nginx. It works fine but filenames becomes like 0000001234. Is there a way to change filenames to original?

Here is the same question, the reply suggests to use additional header with original filename but there's no clear answer how to use it and how to rename the file.

  limit_except POST          { deny all; }

  client_body_temp_path      /www/sitename/uploads;
  client_body_in_file_only   on;
  client_body_buffer_size    128K;
  client_max_body_size       100000M;

  proxy_pass_request_body off;
  proxy_pass_request_headers on;

  proxy_set_header Host $host;
  proxy_set_header X-Real-IP $remote_addr;

  proxy_set_header           X-FILE $request_body_file;
  proxy_set_body             off;
  proxy_redirect             off;
  proxy_pass                 http://farm1;