diff --git a/cms/djangoapps/contentstore/tests/test_video_utils.py b/cms/djangoapps/contentstore/tests/test_video_utils.py
index 0bf8a5b6a103..103c8179a710 100644
--- a/cms/djangoapps/contentstore/tests/test_video_utils.py
+++ b/cms/djangoapps/contentstore/tests/test_video_utils.py
@@ -5,12 +5,13 @@
 
 from datetime import datetime
 from unittest import TestCase
-from unittest.mock import patch
+from unittest.mock import MagicMock, patch
 
 import ddt
 import pytz
 import requests
 from django.conf import settings
+from django.core.files.base import ContentFile
 from django.core.files.storage import get_storage_class
 from django.core.files.uploadedfile import UploadedFile
 from django.test.utils import override_settings
@@ -369,8 +370,14 @@ def test_no_video_thumbnail_downloaded(
         self.assertIsNone(video1_image_url)
 
 
+@ddt.ddt
 class S3Boto3TestCase(TestCase):
     """ verify s3boto3 returns valid backend."""
+
+    def setUp(self):
+        self.storage = S3Boto3Storage()
+        self.storage._connections.connection = MagicMock()  # pylint: disable=protected-access
+
     def test_video_backend(self):
         self.assertEqual(
             S3Boto3Storage,
@@ -390,3 +397,84 @@ def test_boto3_backend_with_params(self):
         )(**settings.VIDEO_IMAGE_SETTINGS.get('STORAGE_KWARGS', {}))
 
         self.assertEqual(S3Boto3Storage, storage.__class__)
+
+    def test_storage_without_global_default_acl_setting(self):
+        """
+        In 1.9.1 package provides the default-acl=`public-read`.
+        AWS_DEFAULT_ACL is not defined but package will send public-read.
+        In 1.10.1 this test will fail because that version has no default value.
+        """
+        name = 'test_storage_save231.txt'
+        content = ContentFile('new content')
+
+        storage = S3Boto3Storage(**{'bucket_name': 'test'})
+        storage._connections.connection = MagicMock()  # pylint: disable=protected-access
+
+        storage.save(name, content)
+        storage.bucket.Object.assert_called_once_with(name)
+
+        obj = storage.bucket.Object.return_value
+        obj.upload_fileobj.assert_called_with(
+            content,
+            ExtraArgs={
+                'ACL': 'public-read',   # it will come from 1.9.1
+                'ContentType': 'text/plain',
+            }
+        )
+
+    @override_settings(AWS_DEFAULT_ACL='public-read')
+    @ddt.data(
+        ('public-read', 'public-read'),
+        ('private', 'private'),
+        (None, None)
+    )
+    @ddt.unpack
+    def test_storage_without_global_default_acl_setting_and_bucket_acls(self, default_acl, output_acl):
+        """
+        AWS_DEFAULT_ACL set to private and let bucket level acl overrides it behaviour.
+        """
+        name = 'test_storage_save.txt'
+        content = ContentFile('new content')
+        storage = S3Boto3Storage(**{'bucket_name': 'test', 'default_acl': default_acl})
+        storage._connections.connection = MagicMock()  # pylint: disable=protected-access
+
+        storage.save(name, content)
+        storage.bucket.Object.assert_called_once_with(name)
+
+        obj = storage.bucket.Object.return_value
+
+        ExtraArgs = {
+            'ACL': output_acl,
+            'ContentType': 'text/plain',
+        }
+
+        if default_acl is None:
+            del ExtraArgs['ACL']
+
+        obj.upload_fileobj.assert_called_with(
+            content,
+            ExtraArgs=ExtraArgs
+        )
+
+    @ddt.data('public-read', 'private')
+    def test_storage_passing_default_acl_as_none(self, input_acl):
+        """
+        check bucket-level None behaviour with different AWS_DEFAULT_ACL
+        """
+        with override_settings(AWS_DEFAULT_ACL=input_acl):
+            name = 'test_storage_save231.txt'
+            content = ContentFile('new content')
+
+            storage = S3Boto3Storage(**{'bucket_name': 'test', 'default_acl': None})
+            storage._connections.connection = MagicMock()   # pylint: disable=protected-access
+
+            storage.save(name, content)
+            storage.bucket.Object.assert_called_once_with(name)
+
+            obj = storage.bucket.Object.return_value
+            obj.upload_fileobj.assert_called_with(
+                content,
+                ExtraArgs={
+                    'ContentType': 'text/plain',
+                }
+            )