Nginx-all-module configuration for RTMP

I installed:

nginx version: nginx/1.19.6 (x86_64-pc-linux-gnu)
built with OpenSSL 1.1.1l  24 Aug 2021
TLS SNI support enabled

and I am trying to use it from LAN side to send rtmp stream from ffmpeg
while I am getting an error in ffmpeg output:

RTMP_Connect0, failed to connect socket. 10061 (Unknown error)
rtmp:// Unknown error occurred

I try to put nginx.conf in etc/nginx or under /conf.d as additional.config
and RTMP part is usual:

events {
	worker_connections  8192;
	# max value 32768, nginx recycling connections+registry optimization = 
	#   this.value * 20 = max concurrent connections currently tested with one worker
	#   C1000K should be possible depending there is enough ram/cpu power
	# multi_accept on;
rtmp {
  server {
    listen 1935;
    chunk_size 4096;
    application live {
      live on;
      record off;

I was following this explanation on the changed structure under luci:

I am not getting it. Could someone give me a hand on this please.

Kind Regards.