K8s Ingress Proxy Body Size Annotation Quotes Removed After Applying and Getting 413 Error

Question

I'm working with a Kubernetes (k8s) Ingress and need to increase the upload size limit. I added the following annotation to my Ingress definition:

  annotations:
    nginx.ingress.kubernetes.io/proxy-body-size: '200m'

However, I still receive a 413 Request Entity Too Large error when trying to upload files.

Additionally, I've noticed that the quotes around the proxy-body-size value are removed after the Ingress is applied. Here is my full Ingress configuration:

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: app-uat
  namespace: app-uat
  annotations:
    ingress.kubernetes.io/ssl-redirect: 'false'
    nginx.org/redirect-to-https: 'false'
    nginx.ingress.kubernetes.io/proxy-body-size: '200m'
spec:
  ingressClassName: nginx
  tls:
    - hosts: 
      - mydomain.com
      secretName: mydomain-tls
  rules:
    - host: mydomain.com
      http:
        paths:
          - path: /core/
            pathType: Prefix
            backend:
              service:
                name: app-core
                port:
                  number: 80
          - path: /proxy/
            pathType: Prefix
            backend:
              service:
                name: app-proxy
                port:
                  number: 80
          - path: /panel/
            pathType: Prefix
            backend:
              service:
                name: admin-panel
                port:
                  number: 80

Questions:

1. Why am I still getting the 413 Payload Too Large error despite adding the nginx.ingress.kubernetes.io/proxy-body-size annotation?
2. Why are the quotes around the proxy-body-size value removed after the Ingress is applied, and does this affect the functionality? Because I've read somewhere that the nginx annotations should be quoted.