Hi @braga – Did you check the permissions on each of the file within the bucket (Step#8 of setting up Amazon S3 at Datasets using S3 files in another AWS account - Amazon QuickSight)? They default to ACLs disabled. If you have a lot of files to share, you can instead create an S3 bucket policy on the s3:GetObject action. To use a bucket policy, add it to the bucket permissions, not to the file permissions.
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