Hi @Glenvill - Welcome to the community! When QuickSight executes queries for Athena datasets, it writes the query results to an S3 bucket named “aws-athena-query-results-AWSREGION-AWSACCOUNTID”. This is the default behavior for storing Athena query results.
The bucket stores the output of queries that QuickSight executes when refreshing datasets or running any queries for Athena datasets. These query results are saved as CSV files in the bucket.
Please refer to this related community post as well.