Upload stoppt bei 7,2MB

Steps to reproduce

Hi zusammen,
Ich habe Nextcloud als Docker-Image neben 2 anderen Containern mit Web-Anwendungen installiert und davor eine Nginx reverse-proxy geschaltet.
Meine Docker-compose.yml:

version: '3.7'

services:
  db:
    image: mariadb
    command: --transaction-isolation=READ-COMMITTED --binlog-format=ROW
    restart: always
    volumes:
      - ./data/db:/var/lib/mysql
    environment:
      MYSQL_ROOT_PASSWORD: H37Y*s!J
      MYSQL_PASSWORD: Y2Y~7MN[
      MYSQL_DATABASE: nextcloud
      MYSQL_USER: nextcloud

  app:
    image: nextcloud:19
    restart: always
    ports:
      - 8001:80
    depends_on:
      - db
    environment:
      VIRTUAL_HOST: cloud.manfredhoffer.ch
      OVERWRITEHOST: cloud.manfredhoffer.ch
    volumes:
      - ./data/nextcloud:/var/www/html

Meine Nginx-Conf:
server {

  server_name cloud.manfredhoffer.ch;
  add_header Strict-Transport-Security "max-age=15552000; includeSubDomains";
  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;

  location / {
      proxy_pass http://localhost:8001;
  }

  location = /.well-known/carddav {
      return 301 $scheme://$host:$server_port/remote.php/dav;
  }
  location = /.well-known/caldav {
      return 301 $scheme://$host:$server_port/remote.php/dav;
  }

    listen [::]:443 ssl; # managed by Certbot
    listen 443 ssl; # managed by Certbot
    ssl_certificate /etc/letsencrypt/live/cloud.manfredhoffer.ch/fullchain.pem; # managed by Certbot
    ssl_certificate_key /etc/letsencrypt/live/cloud.manfredhoffer.ch/privkey.pem; # managed by Certbot
    include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
    ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot

}
server {
    if ($host = cloud.manfredhoffer.ch) {
        return 301 https://$host$request_uri;
    } # managed by Certbot

   client_max_body_size 10G;
    fastcgi_buffers 64 4K;

  listen 80;
  listen [::]:80;

  server_name cloud.manfredhoffer.ch;
    return 404; # managed by Certbot


}

Expected behaviour

/

Actual behaviour

Alles funktioniert soweit, jedoch friert der Dateiupload im Browserfenster bei genau 7,2MB ein.

Server configuration detail

Operating system: Linux 4.15.0-108-generic #109-Ubuntu SMP Fri Jun 19 11:33:10 UTC 2020 x86_64

Webserver: Apache/2.4.38 (Debian) (apache2handler)

Database: mysql 10.4.12

PHP version:

7.4.7
Modules loaded: Core, date, libxml, openssl, pcre, sqlite3, zlib, ctype, curl, dom, fileinfo, filter, ftp, hash, iconv, json, mbstring, SPL, PDO, session, posix, Reflection, standard, SimpleXML, pdo_sqlite, Phar, tokenizer, xml, xmlreader, xmlwriter, mysqlnd, apache2handler, apcu, bcmath, exif, gd, gmp, imagick, intl, ldap, memcached, pcntl, pdo_mysql, pdo_pgsql, redis, sodium, zip, Zend OPcache

Nextcloud version: 19.0.0 - 19.0.0.12

Updated from an older Nextcloud/ownCloud or fresh install:

Where did you install Nextcloud from: unknown

Signing status

Array
(
)

List of activated apps
Enabled:
 - accessibility: 1.5.0
 - activity: 2.12.0
 - bruteforcesettings: 1.6.0
 - calendar: 2.0.3
 - cloud_federation_api: 1.2.0
 - comments: 1.9.0
 - contacts: 3.3.0
 - contactsinteraction: 1.0.0
 - dav: 1.15.0
 - federatedfilesharing: 1.9.0
 - federation: 1.9.0
 - files: 1.14.0
 - files_pdfviewer: 1.8.0
 - files_rightclick: 0.16.0
 - files_sharing: 1.11.0
 - files_trashbin: 1.9.0
 - files_versions: 1.12.0
 - files_videoplayer: 1.8.0
 - firstrunwizard: 2.8.0
 - issuetemplate: 0.6.0
 - logreader: 2.4.0
 - lookup_server_connector: 1.7.0
 - mail: 1.4.0
 - nextcloud_announcements: 1.8.0
 - notifications: 2.7.0
 - oauth2: 1.7.0
 - password_policy: 1.9.1
 - photos: 1.1.0
 - privacy: 1.3.0
 - provisioning_api: 1.9.0
 - recommendations: 0.7.0
 - serverinfo: 1.9.0
 - settings: 1.1.0
 - sharebymail: 1.9.0
 - spreed: 9.0.1
 - support: 1.2.1
 - survey_client: 1.7.0
 - systemtags: 1.9.0
 - text: 3.0.1
 - theming: 1.10.0
 - twofactor_backupcodes: 1.8.0
 - updatenotification: 1.9.0
 - viewer: 1.3.0
 - workflowengine: 2.1.0
Disabled:
 - admin_audit
 - encryption
 - files_external
 - user_ldap

Configuration (config/config.php)
{
    "htaccess.RewriteBase": "\/",
    "memcache.local": "\\OC\\Memcache\\APCu",
    "apps_paths": [
        {
            "path": "\/var\/www\/html\/apps",
            "url": "\/apps",
            "writable": false
        },
        {
            "path": "\/var\/www\/html\/custom_apps",
            "url": "\/custom_apps",
            "writable": true
        }
    ],
    "overwritehost": "cloud.manfredhoffer.ch",
    "instanceid": "***REMOVED SENSITIVE VALUE***",
    "passwordsalt": "***REMOVED SENSITIVE VALUE***",
    "secret": "***REMOVED SENSITIVE VALUE***",
    "trusted_domains": [
        "cloud.manfredhoffer.ch"
    ],
    "datadirectory": "***REMOVED SENSITIVE VALUE***",
    "dbtype": "mysql",
    "version": "19.0.0.12",
    "overwrite.cli.url": "http:\/\/cloud.manfredhoffer.ch",
    "dbname": "***REMOVED SENSITIVE VALUE***",
    "dbhost": "***REMOVED SENSITIVE VALUE***",
    "dbport": "",
    "dbtableprefix": "oc_",
    "mysql.utf8mb4": true,
    "dbuser": "***REMOVED SENSITIVE VALUE***",
    "dbpassword": "***REMOVED SENSITIVE VALUE***",
    "installed": true,
    "app_install_overwrite": [
        "issuetemplate"
    ]
}

Are you using external storage, if yes which one: local/smb/sftp/…

Are you using encryption:

Are you using an external user-backend, if yes which one: LDAP/ActiveDirectory/Webdav/…

Client configuration

Browser: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.116 Safari/537.36

Operating system: Windows 10 Professional 64-Bit

Logs

Web server error log
/
Nextcloud log
Nextcloud zeigt einen "Unbekannten Fehler" an und im log wird nichts näher erläutert.
Browser log

/

Ich würde mich sehr freuen, wenn mir jemand bei diesem Problem helfen kann.
Liebe Grüße
Jonas Rademacher