Nginx: https_upload module save files with their original name instead of a number?

I’m using the ngx_http_upload_module in Nginx to handle file uploads. Currently, it saves the uploaded files with an incrementing number instead of their original names. I want to preserve the original filenames when saving these files to my specified directory. I understand that the module allows access to the original file name through the $upload_file_name variable, but I’m not sure how to effectively use this to save the file under its original name.

Is there a direct way to configure the ngx_http_upload_module to save files with their original names?

Here is my current nginx code:

location /upload {
    upload_pass   @backend;

    upload_store /var/upload;

    upload_set_form_field $upload_field_name.name "$upload_file_name";
    upload_set_form_field $upload_field_name.content_type "$upload_content_type";
    upload_set_form_field $upload_field_name.path "$upload_tmp_path";

    upload_aggregate_form_field "$upload_field_name.md5" $upload_file_md5;
    upload_aggregate_form_field "$upload_field_name.size" $upload_file_size;

    upload_cleanup 400 404 499 500-505;
}

location @backend {
    proxy_pass   http://localhost:8080;
}