HerokuにデプロイされたDjangoアプリからS3にアップロードされたメディアデータを取得できない

表題の通り、S3へメディアデータ（.png）を保存はできますが、アプリ上でデータを取得できず途方に暮れています。どうしたらデータを取得できるのか、お分かりの方御指南いただけるとありがたいです。よろしくお願いいたします。
###Procfile
release: python manage.py migrate
web: gunicorn config.wsgi --log-file -
###requirements.txt
boto3==1.17.80
botocore==1.20.80
dj-database-url==0.5.0
Django==2.2.23
django-environ==0.4.5
django-heroku==0.3.1
django-storages==1.11.1
gunicorn==20.1.0
jmespath==0.10.0
Pillow==8.2.0
psycopg2==2.8.6
python-dateutil==2.8.1
pytz==2021.1
s3transfer==0.4.2
six==1.16.0
sqlparse==0.4.1
urllib3==1.26.4
whitenoise==5.2.0
###runtime.txt
python-3.6.13
###S3設定等

パブリックアクセス設定：すべてオフ
バケットポリシー：記述なし
ACL:デフォルト
CORS:以下の通り

json
1[
2    {
3        "AllowedHeaders": [
4            "*"
5        ],
6        "AllowedMethods": [
7            "GET",
8            "POST",
9            "PUT"
10        ],
11        "AllowedOrigins": [
12            "mydomain/*"
13        ],
14        "ExposeHeaders": [],
15        "MaxAgeSeconds": 3000
16    }
17]

###settings/production.py

python
1AWS_ACCESS_KEY_ID = os.environ['AWS_ACCESS_KEY_ID']
2AWS_SECRET_ACCESS_KEY = os.environ['AWS_SECRET_ACCESS_KEY']
3AWS_STORAGE_BUCKET_NAME = os.environ['AWS_STORAGE_BUCKET_NAME']
4AWS_S3_CUSTOM_DOMAIN = '%s.s3.amazonaws.com' % AWS_STORAGE_BUCKET_NAME
5AWS_S3_OBJECT_PARAMETERS = {
6'CacheControl': 'max-age=86400',
7}
8AWS_LOCATION = 'media'
9DEFAULT_FILE_STORAGE = 'config.settings.storage_backends.MediaStorage'
10MEDIA_URL = "https://%s/%s/" % (AWS_S3_CUSTOM_DOMAIN, AWS_LOCATION)

###settings/storage_backends.py

python
1from storages.backends.s3boto3 import S3Boto3Storage
2
3class MediaStorage(S3Boto3Storage):
4    location = 'media'
5    file_overwrite = False

###model.py

python
1from django.db import models
2
3class BoardModel(models.Model):
4    title = models.CharField(max_length=100)
5    content = models.TextField()
6    author = models.CharField(max_length=100)
7    images = models.ImageField(upload_to='')
8    good = models.IntegerField(null=True, blank=True, default=0)
9    read = models.IntegerField(null=True, blank=True, default=0)
10    readtext = models.CharField(max_length=200, null=True, blank=True, default='default')
11

###views.py

python
1from django.shortcuts import render
2from django.contrib.auth.models import User
3from django.contrib.auth import authenticate, login, logout
4from django.shortcuts import redirect
5from django.contrib.auth.decorators import login_required
6from django.views.generic import CreateView
7from django.urls import reverse_lazy
8
9from .models import BoardModel
10
11def detailfunc(request, pk):
12    object = BoardModel.objects.get(pk=pk)
13    return render(request, 'detail.html', {'object':object})
14
15class BoardCreate(CreateView):
16    template_name = 'create.html'
17    model = BoardModel
18    fields = ('title', 'content', 'author', 'images')
19    success_url = reverse_lazy('list')

###html
#####detail.html
{% block content %}

<div class="container"> <div class="alert alert-success" role="alert"> <p>タイトル：{{ object.title }}</p> <p>投稿者：{{ object.author }}</p> <p>内容：{{ object.content }}</p> <p>URL：{{ object.images.url }}</p> <p><img src='{{ object.images.url }}' width=300></p> </div> </div> {% endblock content %} #####create.html {% block content %} {% if user.is_authenticated %} <form action="" method="POST" enctype="multipart/form-data">{% csrf_token %} <p>タイトル：<input type="text" name="title"></p> <p>内容：<input type="text" name="content"></p> <p>画像：<input type="file" name="images"></p> <input type="hidden" name="author" value="{{ user.username}}"> <input type="submit" value="作成する"> </form> {% else %} ログインしてください {% endif %} {% endblock content %}