413 Request Entity Too Large in Nginx and Amazon ElasticBeanstalk

There are a lot of answers to this problem (question 1question 2) but this solution that should work, doesn't work for me:

files:"/etc/nginx/conf.d/proxy.conf" :    mode: "000755"    owner: root    group: root    content: |        client_max_body_size 50M;

I have checked the status and contents of this created file via ssh and its correct. I also have tried other values and restarted the server multiple times.

client_max_body_size 0;

or

http {   client_max_body_size 50M;}

This values do not work either.

it just wont work, even with "just" a 6mb image. it work with smaller images around size of 0.5mb. It's a RoR app with "64bit Amazon Linux 2018.03 v2.8.0 running Ruby 2.5 (Puma)". The instance size is t2.micro.