S3 Bucket is not valid

Hello,

I'm trying to configure ZExtras PowerStore with Amazon S3 bucket, but I'm receiving this message in my Zimbra console when I press test button: S3 bucket is not valid.

My bucket policy is this:

{
"Version": "2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Action": [
"s3:PutObject",
"s3:GetObject",
"s3:DeleteObject",
"s3:AbortMultipartUpload"
],
"Resource": [
"arn:aws:s3:::bucket-name/*",
"arn:aws:s3:::bucket-name"
]
}
]
}

In Zimbra console I complete fields like this example:

Bucket Name: bucket-name
AK: my AK
SK: my SK
Destination Path: /bucket-name/folder ( I tried only with folder name too, no success )
Region: US_EAST_1
ARN: arn:aws:s3:::bucket-name/folder/

Please help me to configure this feature.

Thank you very much.

Cheers,

André