IAM Policy for OpsCenter backup to S3 user

Using OpsCenter 5.1.0 and trying to add S3 as a location for snapshot backups. What are the necessary permissions in AWS IAM for the opscenter user? So far, I have the following policy:

"Statement": [ { "Effect": "Allow", "Action": [ "s3:ListAllMyBuckets", "s3:GetBucketLocation" ], "Resource": "arn:aws:s3:::*" }, { "Effect": "Allow", "Action": [ "s3:ListBucket", "s3:GetBucketLocation" ], "Resource": [ "arn:aws:s3:::cassandra-bkup" ] }, { "Effect": "Allow", "Action": [ "s3:DeleteObject", "s3:GetObject", "s3:PutObject" ], "Resource": [ "arn:aws:s3:::cassandra-bkup/*" ] } ]

but backups are still failing. In opscenterd.log, the following error is seen:

WARN: Marking request af93899e-ae89-4ada-8b3b-ef93d0272d61 as failed: {'sstables': {'reporting_test': {u'cards': {'total_size': 9829, 'total_files': 6, 'done_files': 0, 'errors': [u'{:cause :unknown-destination-provider, :message "Specified provider unknown."}', u'{:cause :unknown-destination-provider, :message "Specified provider unknown."}', u'{:cause :unknown-destination-provider, :message "Specified provider unknown."}', u'{:cause :unknown-destination-provider, :message "Specified provider unknown."}', u'{:cause :unknown-destination-provider, :message "Specified provider unknown."}', u'{:cause :unknown-destination-provider, :message "Specified provider unknown."}']}, etc, etc.

Backup to local server succeeds, however.

After some trial and error, I found that the following policy worked

{ "Version": "2012-10-17", "Statement": [ { "Effect": "Allow", "Action": [ "s3:ListAllMyBuckets", "s3:GetBucketLocation" ], "Resource": "arn:aws:s3:::*" }, { "Effect": "Allow", "Action": [ "s3:ListBucket", "s3:GetBucketLocation", "s3:GetBucketAcl" ], "Resource": [ "arn:aws:s3:::prod-bkup" ] }, { "Effect": "Allow", "Action": [ "s3:DeleteObject", "s3:GetObject", "s3:PutObject" ], "Resource": [ "arn:aws:s3:::prod-bkup/*" ] } ] }

EDIT: added s3:GetBucketAcl as a required permission