Add the code below to allow your S3 bucket to be accessed by Liberator...
{
"Version": "2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Action": [
"s3:GetObject",
"s3:PutObject",
"s3:GetObjectVersion"
],
"Resource": "arn:aws:s3:::<bucket-name>/*"
},
{
"Effect": "Allow",
"Action": [
"s3:ListBucket",
"s3:GetBucketVersioning",
"s3:ListBucketVersions",
"s3:GetBucketLocation"
],
"Resource": "arn:aws:s3:::<bucket-name>"
}
]
}