AmazonS3に保存した画像がリンク切れになる

Question

前提・実現したいこと

ここに質問の内容を詳しく書いてください。
Djangoのアプリ上でAmazonS3に保存した画像がリンク切れになります。

発生している問題・エラーメッセージ

検証ツールのコンソール
Failed to load resource: the server responded with a status of 403 (Forbidden)

該当のソースコード

"""
Django settings for myproject project.

Generated by 'django-admin startproject' using Django 2.1.5.

For more information on this file, see
https://docs.djangoproject.com/en/2.1/topics/settings/

For the full list of settings and their values, see
https://docs.djangoproject.com/en/2.1/ref/settings/
"""

import os

# Build paths inside the project like this: os.path.join(BASE_DIR, ...)
BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))


# Quick-start development settings - unsuitable for production
# See https://docs.djangoproject.com/en/2.1/howto/deployment/checklist/



# SECURITY WARNING: don't run with debug turned on in production!
DEBUG = False

ALLOWED_HOSTS = ['*']


# Application definition

INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'myapp',
    'django.contrib.sites',
    'sitemanage',
    'storages',
]

SITE_ID = 1

MIDDLEWARE = [
    'django.middleware.security.SecurityMiddleware',
    'whitenoise.middleware.WhiteNoiseMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.common.CommonMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    'django.middleware.clickjacking.XFrameOptionsMiddleware',
    'django.contrib.sites.middleware.CurrentSiteMiddleware',
]

ROOT_URLCONF = 'myproject.urls'

TEMPLATES = [
    {
        'BACKEND': 'django.template.backends.django.DjangoTemplates',
        'DIRS': [],
        'APP_DIRS': True,
        'OPTIONS': {
            'context_processors': [
                'django.template.context_processors.debug',
                'django.template.context_processors.request',
                'django.contrib.auth.context_processors.auth',
                'django.contrib.messages.context_processors.messages',
                'django.template.context_processors.media',
                'myapp.context_processors.all_category',
            ],
        },
    },
]

WSGI_APPLICATION = 'myproject.wsgi.application'


# Database
# https://docs.djangoproject.com/en/2.1/ref/settings/#databases

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.sqlite3',
        'NAME': os.path.join(BASE_DIR, 'db.sqlite3'),
    }
}


# Password validation
# https://docs.djangoproject.com/en/2.1/ref/settings/#auth-password-validators

AUTH_PASSWORD_VALIDATORS = [
    {
        'NAME': 'django.contrib.auth.password_validation.UserAttributeSimilarityValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.MinimumLengthValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.CommonPasswordValidator',
    },
    {
        'NAME': 'django.contrib.auth.password_validation.NumericPasswordValidator',
    },
]


# Internationalization
# https://docs.djangoproject.com/en/2.1/topics/i18n/

LANGUAGE_CODE = 'ja'

TIME_ZONE = 'Asia/Tokyo'

USE_I18N = True

USE_L10N = True

USE_TZ = True


# Static files (CSS, JavaScript, Images)
# https://docs.djangoproject.com/en/2.1/howto/static-files/

STATIC_URL = '/static/'

# ログイン機能の追加
LOGIN_URL = 'myapp:login'
LOGIN_REDIRECT_URL = 'myapp:index'

# S3のための記述
AWS_STORAGE_BUCKET_NAME = 'バケット名'
AWS_S3_CUSTOM_DOMAIN = '%s.s3.amazonaws.com' % AWS_STORAGE_BUCKET_NAME
AWS_S3_OBJECT_PARAMETERS = {
    'CacheControl': 'max-age=86400'#一日はそのキャッシュを使う
}
AWS_LOCATION = 'media'
DEFAULT_FILE_STORAGE = 'storages.backends.s3boto3.S3Boto3Storage'
MEDIA_ROOT = os.path.join(BASE_DIR,'media')
# MEDIA_URL = '/media/'
MEDIA_URL = "https://%s/%s/" % (AWS_S3_CUSTOM_DOMAIN,AWS_LOCATION)
# herokuのための追記

import dj_database_url
DATABASES['default'] = dj_database_url.config()

SECURE_PROXY_SSL_HEADER = ('HTTP_X_FOWARDED_PROTO', 'https')

ALLOWED_HOSTS = ['*']

STATICFILES_DIRS = (os.path.join(BASE_DIR, 'static'),)

STATIC_ROOT = os.path.join(BASE_DIR, 'staticfiles')

DEBUG = False

try:
    from .local_settings import *
except ImportError:
    pass

if not DEBUG:
    SECRET_KEY = os.environ['SECRET_KEY']
    AWS_ACCESS_KEY_ID = os.environ['AWS_ACCESS_KEY_ID']
    AWS_SECRET_ACCESS_KEY = os.environ['AWS_SECRET_ACCESS_KEY']

settings.py


asgiref==3.2.10
certifi==2020.6.20
chardet==3.0.4
dj-database-url==0.5.0
dj-static==0.0.6
Django==3.1
gunicorn==20.0.4
idna==2.8
Pillow==5.4.1
psycopg2-binary==2.8.2
pytz==2020.1
requests==2.21.0
setuptools==49.2.0
sqlparse==0.3.1
static3==0.7.0
urllib3==1.24.1
whitenoise==5.2.0
django-storages==1.10.1
boto3==1.15.0
botocore==1.18.0
jmespath==0.10.0
python-dateutil==2.8.1
s3transfer==0.3.3
six==1.15.0 

試したこと

AWS_ACCESS_KEY_ID とAWS_SECRET_ACCESS_KEYの確認→問題ありませんでした。環境変数設定もOKです。
S3バケットのパブリックブロックをオフになっているか確認→オフになっていました。

補足情報（FW/ツールのバージョンなど）

python　3.7.9
django ３.１