Hi, I notice that CompleteMultipartUploadResult does return an empty ETag field when completing an multipart upload in v17.2.3. I haven't had the possibility to verify from which version this changed and can't find in the changelog that it should be fixed in newer version. The response looks like: <?xml version="1.0" encoding="UTF-8"?> <CompleteMultipartUploadResult xmlns="http://s3.amazonaws.com/doc/2006-03-01/ <http://s3.amazonaws.com/doc/2006-03-01/>"> <Location>s3.myceph.com/test-bucket/test.file</Location> <Bucket>test-bucket</Bucket> <Key>test.file</Key> <ETag></ETag> </CompleteMultipartUploadResult> I have found a old issue that is closed around 9 years ago with the same issue so I guess that this has been fixed before. https://tracker.ceph.com/issues/6830 <https://tracker.ceph.com/issues/6830> It looks like my account to the tracker is still not activated so I can't create or comment on the issue. Best regards, Lars Dunemark