Hi @feng-tao , my day-to-day use cases are normally copying within one bucket.
But I believe copying across buckets is allowed. I'm trying to refer to `boto3`
documentation
1.
https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/s3.html#S3.Client.copy_object
2.
https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/s3.html#S3.Client.copy.
One sample provided in the documentation is
```
import boto3
s3 = boto3.resource('s3')
copy_source = {
'Bucket': 'mybucket',
'Key': 'mykey'
}
s3.meta.client.copy(copy_source, 'otherbucket', 'otherkey')
```
which is an across-buckets case.
[ Full content available at:
https://github.com/apache/incubator-airflow/pull/3823 ]
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