このエラーメッセージに関する原因と対処に関して説明します。
エラーメッセージ(英語)：
rds cannot share snapshot
対処
関連リンク
DB のスナップショットの共有 - Amazon Relational Database Service
https://docs.aws.amazon.com/ja_jp/AmazonRDS/latest/UserGuide/USER_ShareSnapshot.html
Sharing a DB Snapshot - Amazon Relational Database Service - AWS ...
https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_ShareSnapshot.html
Share Manual RDS Snapshots With Another ... - AWS - Amazon.com
https://aws.amazon.com/premiumsupport/knowledge-center/rds-snapshots-share-account/
Copying a Snapshot - Amazon Relational Database Service - AWS ...
https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_CopySnapshot.html
Amazon RDS Update ? Cross-Account Snapshot Sharing | AWS News ...
https://aws.amazon.com/blogs/aws/amazon-rds-update-cross-account-snapshot-sharing/
Amazon RDS now supports sharing database snapshots across ...
https://aws.amazon.com/about-aws/whats-new/2015/10/amazon-rds-now-supports-sharing-database-snapshot・・・
RDS now supports sharing encrypted database snapshots with other ...
https://aws.amazon.com/about-aws/whats-new/2016/02/rds-now-supports-sharing-encrypted-database-snaps・・・
AWS Knowledge Center Videos: How do I share database snapshots ...
https://www.youtube.com/watch?v=s8gamawDuQY
https://www.youtube.com/watch?v=s8gamawDuQY
Can RDS snapshots be transferred across AWS accounts? - Stack Overflow
https://stackoverflow.com/questions/18192609/can-rds-snapshots-be-transferred-across-aws-accounts