AWS s3 & Django & Nginx. Configuration?

Question

Django

(I’ll say right away that it works perfectly on localhost)

I made a configuration for my s3 bucket, Django media files and Nginx server.
It worked, the pictures loaded and showed, but after a few hours it no longer works ...
I don't know if it matters, but I created a bucket policy s3 for the "getObject" action with the condition that the request must have a User-Agent header with a secret line, for example: My Django AWS Configuration (django_storages):
curl -I some.url -H "User-Agent: dog"

AWS_ACCESS_KEY_ID = 'my_access'
AWS_SECRET_ACCESS_KEY = 'my_private'
AWS_STORAGE_BUCKET_NAME = 'diasmart-media-static'

S3_REGION = 'eu-north-1'
AWS_S3_CUSTOM_DOMAIN = f'https://s3-{S3_REGION}.amazonaws.com/{AWS_STORAGE_BUCKET_NAME}'
AWS_S3_SIGNATURE_VERSION = 's3v4'

AWS_S3_FILE_OVERWRITE = False
AWS_DEFAULT_ACL = None
DEFAULT_FILE_STORAGE = 'storages.backends.s3boto3.S3Boto3Storage'


# Static and media
STATIC_URL = '/static/'
STATIC_ROOT = os.path.join(BASE_DIR, 'assets')
STATICFILES_DIRS = [
    os.path.join(BASE_DIR, 'static')
]

MEDIA_URL = '/media/'

My Nginx config

location /media {
                resolver 8.8.8.8;

                limit_except GET {
                        deny all;
                }

                set $aws_bucket "diasmart-media-static";
                set $aws_endpoint "s3-eu-north-1.amazonaws.com";
                set $aws_custom_secret "for_example_dog";

                proxy_set_header User-Agent $aws_custom_secret;

                rewrite ^/media/(.*)$ /$aws_bucket/$1 break;
                proxy_buffering off;
                proxy_pass https://$aws_endpoint;
        }

When I upload photos from the Django admin page, there are no errors, but no images are shown.
And my s3 bucket is empty...