To create custom AWS S3 storage do the following:

  1. Create Amazon AWS account.
  2. Create IAM user with S3 bucket permissions

3. Create IAM policy

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "VisualEditor0",
            "Effect": "Allow",
            "Action": "s3:ListBucket",
            "Resource": "arn:aws:s3:::bucketname"
        },
        {
            "Sid": "VisualEditor1",
            "Effect": "Allow",
            "Action": "s3:GetObject",
            "Resource": "arn:aws:s3:::bucketname/*"
        },
        {
            "Sid": "VisualEditor2",
            "Effect": "Allow",
            "Action": [
                "s3:PutAnalyticsConfiguration",
                "s3:GetObjectVersionTagging",
                "s3:CreateBucket",
                "s3:ReplicateObject",
                "s3:GetObjectAcl",
                "s3:DeleteBucketWebsite",
                "s3:PutLifecycleConfiguration",
                "s3:GetObjectVersionAcl",
                "s3:DeleteObject",
                "s3:GetIpConfiguration",
                "s3:GetBucketWebsite",
                "s3:PutReplicationConfiguration",
                "s3:GetBucketNotification",
                "s3:PutBucketCORS",
                "s3:GetReplicationConfiguration",
                "s3:ListMultipartUploadParts",
                "s3:PutObject",
                "s3:GetObject",
                "s3:PutBucketNotification",
                "s3:PutBucketLogging",
                "s3:GetAnalyticsConfiguration",
                "s3:GetObjectVersionForReplication",
                "s3:GetLifecycleConfiguration",
                "s3:ListBucketByTags",
                "s3:GetInventoryConfiguration",
                "s3:GetBucketTagging",
                "s3:PutAccelerateConfiguration",
                "s3:DeleteObjectVersion",
                "s3:GetBucketLogging",
                "s3:ListBucketVersions",
                "s3:RestoreObject",
                "s3:ListBucket",
                "s3:GetAccelerateConfiguration",
                "s3:GetBucketPolicy",
                "s3:GetObjectVersionTorrent",
                "s3:AbortMultipartUpload",
                "s3:GetBucketRequestPayment",
                "s3:GetObjectTagging",
                "s3:GetMetricsConfiguration",
                "s3:DeleteBucket",
                "s3:PutBucketVersioning",
                "s3:ListBucketMultipartUploads",
                "s3:PutMetricsConfiguration",
                "s3:GetBucketVersioning",
                "s3:GetBucketAcl",
                "s3:PutInventoryConfiguration",
                "s3:PutIpConfiguration",
                "s3:GetObjectTorrent",
                "s3:PutBucketWebsite",
                "s3:PutBucketRequestPayment",
                "s3:GetBucketCORS",
                "s3:GetBucketLocation",
                "s3:ReplicateDelete",
                "s3:GetObjectVersion"
            ],
            "Resource": "arn:aws:s3:::bucketname/*"
        },
        {
            "Sid": "VisualEditor3",
            "Effect": "Allow",
            "Action": [
                "s3:ListAllMyBuckets",
                "s3:HeadBucket",
                "s3:ListObjects"
            ],
            "Resource": "*"
        }
    ]
}

4. Assign created policy to IAM user:

5. Create S3 bucket with necessary custom name and in necessary region:

6. Choose Static website hosting and index document index.html:

7. Set Bucket permission policy:

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "PublicReadGetObject",
            "Effect": "Allow",
            "Principal": "*",
            "Action": "s3:GetObject",
            "Resource": "arn:aws:s3:::bucketname/*"
        }
    ]
}

8. Uncheck List objects from bucket permissions:

9. Add settings to web server, e.g. nginx:

location /content {
  add_header 'Access-Control-Allow-Origin' '*';
  proxy_pass  https:
  proxy_redirect off;
}

10. Enter “YOUR_DOMAIN_ADDRESS/content” as “Base Download URL” when configure plugin settings.

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