Beanstalk's nginx not picking the .conf file on my application source bundle

I have a Spring Boot application built on Beanstalk (Amazon Linux 2), I need to increase the client_max_body_size because some form data I'm posting contains images and I'm getting the 413: Request Too Large Nginx error.

I followed AWS's documentation on how to change this property.

My project structure looks like this now:

And the content of the file is:

client_max_body_size 50M;

After deploying I keep getting the same error (with images > 1MB total).

No file has been created in conf.d:

Is this because how my buildSpec packages my application?

version: 0.2

phases:
  install:
    runtime-versions:
      java: corretto17
  pre_build:
    commands:
      - echo Nothing to do in the pre_build phase...
  build:
    commands:
      - echo Build started on `date`
      - mvn package -Dmaven.test.skip
  post_build:
    commands:
      - echo Build completed on `date`
artifacts:
  files:
    - .platform/nginx/conf.d/proxy.conf
    - target/myApp-0.0.1-SNAPSHOT.jar
    - appspec.yml
  discard-paths: yes

I also tried adding the configuration file into the artifacts.files section of my buildspec.yml.

I also tried to create the file its content from the files section on the buildspec.

I feel like I tried everything, is there anything I may be missing?

For now, my workaround

I manually edited the file:

cd /etc/nginx/
sudo nano nginx.conf

and restarted. That worked, but I want to avoid this manual configuration so it's configured from the application source, as a good practice.

The problem was on my buildspec.

discard-paths: yes

was putting all the files on the root path of the bundle. I needed this so I the jar was on the root, but it was putting the proxy.conf in the root as well.

Setting that property to no (or removing it) made it work, but I needed a way to change the jar from /target/ to the root so I did it with a post-build command:

version: 0.2

phases:
  install:
    runtime-versions:
      java: corretto17
  pre_build:
    commands:
      - echo Nothing to do in the pre_build phase...
  build:
    commands:
      - echo Build started on `date`
      - mvn package -Dmaven.test.skip
  post_build:
    commands:
      - mv target/myApp-0.0.1-SNAPSHOT.jar myApp-0.0.1-SNAPSHOT.jar <------ HERE
      - echo Build completed on `date`
artifacts:
  files:
    - .platform/nginx/conf.d/proxy.conf
    - myApp-0.0.1-SNAPSHOT.jar
    - appspec.yml