How step you follow to make 10,000 files as public in S3?

I will generate a bucket policy which gives access to all the files in the bucket. The bucket policy can be added to a bucket through AWS console.
{
    "Id": "...",
    "Statement": [ {
        "Sid": "...",
        "Action": [
            "s3:GetObject"
        ],
        "Effect": "Allow",
        "Resource": "arn:aws:s3:::bucket/*",
        "Principal": {
            "AWS": [ "*" ]
        }
    } ]
}