Debugging ‘Max File Size Limit’ in Dockerized Dolibarr [closed]

I have a Dolibarr instance running inside Docker, with Nginx as a reverse proxy on the host. Here’s my setup:

docker-compose.yml

services:
    mariadb:
        image: mariadb:latest
        environment:
            MYSQL_ROOT_PASSWORD: ${MYSQL_ROOT_PASSWORD:-root}
            MYSQL_DATABASE: ${MYSQL_DATABASE:-dolidb}
            MYSQL_USER: ${MYSQL_USER:-dolidbuser}
            MYSQL_PASSWORD: ${MYSQL_PASSWORD:-dolidbpass}

        restart: always
        volumes:
            - ./dolibarr_mariadb:/var/lib/mysql

    web:
        # Choose the version of image to install
        # dolibarr/dolibarr:latest (the latest stable version)
        # dolibarr/dolibarr:develop
        # dolibarr/dolibarr:x.y.z
        image: dolibarr/dolibarr:latest
        environment:
            DOLI_INIT_DEMO: ${DOLI_INIT_DEMO:-0}
            DOLI_DB_HOST: ${DOLI_DB_HOST:-mariadb}
            DOLI_DB_NAME: ${DOLI_DB_NAME:-dolidb}
            DOLI_DB_USER: ${DOLI_DB_USER:-dolidbuser}
            DOLI_DB_PASSWORD: ${DOLI_DB_PASSWORD:-dolidbpass}
            DOLI_URL_ROOT: "${DOLI_URL_ROOT:-http://0.0.0.0}"
            DOLI_ADMIN_LOGIN: "${DOLI_ADMIN_LOGIN:-admin}"
            DOLI_ADMIN_PASSWORD: "${DOLI_ADMIN_PASSWORD:-admin}"
            DOLI_CRON: ${DOLI_CRON:-0}
            DOLI_CRON_KEY: ${DOLI_CRON_KEY:-mycronsecurekey}
            DOLI_COMPANY_NAME: ${DOLI_COMPANY_NAME:-MyBigCompany}
            WWW_USER_ID: ${WWW_USER_ID:-1000}
            WWW_GROUP_ID: ${WWW_GROUP_ID:-1000}

        ports:
          - "127.0.0.1:8000:80"
        links:
            - mariadb
        volumes:
            - ./dolibarr_documents:/var/www/documents
            - ./dolibarr_custom:/var/www/html/custom
            - ./dolibarr_php:/usr/local/etc/php

        restart: always

php.ini inside Dolibarr container:

; https://php.net/upload-max-filesize
upload_max_filesize = 20M
; Maximum number of files that can be uploaded via a single request
max_file_uploads = 20

Nginx config on the host:

server {
    listen 80;
    server_name dolibarr.local;

    location / {
            return 301 https://$host$request_uri;
    }
}

server {
    listen 443 ssl;
    server_name dolibarr.local;

    ssl_certificate /etc/nginx/certs/dolibarr.local.crt;
    ssl_certificate_key /etc/nginx/certs/dolibarr.local.key;

    client_max_body_size 20M;

    location / {
        proxy_pass http://127.0.0.1:8000;  
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
    }
}

I am trying to upload files larger than the default limit, but it doesn’t work. I checked Nginx logs and the Dolibarr Docker logs, but nothing appears related to the issue.