When migrating Xray from a Jira Server/Data Center to the Cloud using JCMA (Jira Cloud Migration Assistant), it's important to understand the impact of using S3 storage for attachments.
Key Considerations
Xray and S3 Storage: Xray does not yet support storing attachments on Amazon S3, and the migration to the Cloud will encounter issues with attachments stored in S3.
Migration Behavior:
Attachments Created Before S3 Configuration: Any attachments created before the client configured S3 storage have been moved to S3. Since Xray cannot access attachments stored on S3, the Xray migration will not find these attachments.
Attachments Created After S3 Configuration: Attachments created after the client configured S3 storage behave differently. In these cases, Xray (by chance) can access and migrate the attachments.
For more information, please check the Atlassian documentation: Storing attachments in Amazon S3