Hello, I have following setup in my conf file upload_set_form_field $upload_field_name.name "$upload_file_name"; but I want change chosen param name to: upload_set_form_field ($upload_field_name+"[name]") "$upload_file_name"; so I can get "attachment[name]" but this dont work. I would be very happy if some one help me with merging variable with string in nginx config file :). Best regards, Ernest.