为了解决这个问题，可以通过在Transfer服务的身份提供者或用户角色策略中添加“Put”操作来允许用户将文件上传到目录中，同时仍然禁止用户列出目录。下面是一个示例策略:

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "AllowListingDirectories",
            "Effect": "Allow",
            "Action": [
                "s3:ListBucket",
                "s3:GetBucketLocation"
            ],
            "Resource": "arn:aws:s3:::your-bucket-name"
        },
        {
            "Sid": "DenyListingDirectories",
            "Effect": "Deny",
            "Action": [
                "s3:ListBucket"
            ],
            "Resource": "arn:aws:s3:::your-bucket-name",
            "Condition": {
                "StringNotLike": {
                    "s3:prefix": [
                        "",
                        "directory-path/*"
                    ]
                }
            }
        },
        {
            "Sid": "AllowWritingFiles",
            "Effect": "Allow",
            "Action": [
                "s3:PutObject"
            ],
            "Resource": "arn:aws:s3:::your-bucket-name/directory-path/*"
        }
    ]
}

以上策略允许用户上传到指定的目录路径中，并禁止列出此路径外的所有内容。但是，用户可以通过确切的路径名称来访问此目录，例如：sftp://transfer-server-name/directory-path/file-name.txt