Github user kjmrknsn commented on the issue:
https://github.com/apache/zeppelin/pull/2598
@Leemoonsoo Thanks for your review. I added the property of
`ZEPPELIN_NOTEBOOK_S3_SIGNEROVERRIDE` to configuration.md:
https://github.com/apache/zeppelin/pull/2598/files#diff-d86fb0bb17c918e22cb888ebfe0ff1cc
(Commits were squashed.)---
