Bad Gateway and 404 Error When Uploading Large Files via Traefik and Payload CMS

Traefik Traefik v3 (latest)
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1

I'm using k3s and Helm for my deployment. Traefik is provided by default with k3s, so there's no custom Traefik configuration — only an Ingress for my service.

When uploading a file through Payload CMS, I encounter an error. If someone is accessing the admin panel at the same time as the upload, the request results in a Bad Gateway, followed by a 404 error.

Here's my current Ingress configuration for Payload CMS:

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: payloadcms-ingress
  namespace: {{ .Values.namespace }}
  annotations:
    traefik.ingress.kubernetes.io/router.entrypoints: websecure
    traefik.ingress.kubernetes.io/router.tls: "true"
    cert-manager.io/cluster-issuer: letsencrypt-prod
spec:
  ingressClassName: traefik
  rules:
    - host: {{ .Values.payloadcms.ingress.host }}
      http:
        paths:
          - path: /
            pathType: Prefix
            backend:
              service:
                name: payloadcms
                port:
                  number: 3000
  tls:
    - hosts:
        - {{ .Values.payloadcms.ingress.host }}
      secretName: {{ .Values.payloadcms.ingress.tlsSecretName }}
2

Have you determined if there is a specific size limit?