Bulk Import attachments from Legacy to help desk/case management

Summary:

As part of our HR Help Desk and Case Management implementation, we're exploring options for bulk importing attachments (e.g., PDFs, Word documents—including some password-protected files) associated with service requests and cases. We're looking to ensure data integrity while minimizing performance impact during the migration. Could you please advise on the most effective method to achieve this—whether through REST APIs, Oracle Integration Cloud (OIC), or Import Management? If anyone has handled a similar use case in the past, your insights and recommendations would be greatly appreciated

Content (please ensure you mask any confidential information):

Version (include the version you are using, if applicable):