Using an Embedded File Server in Oracle Integration Cloud (OIC) allows you to temporarily store and retrieve files as part of your integration flows. It is particularly useful when you need to handle files within an integration and do not want to use an external FTP server or other storage service.

Here’s a high-level approach to using the Embedded File Server in OIC:

1. Enable the Embedded File Server:
   
   1. By default, the embedded file server might not be enabled. You can enable it from the OIC console under the ‘Settings’ area.
2. Configure Security:
   
   1. Ensure that proper security is configured for the file server. You should restrict access to authorized integrations only.
3. Use in Integration Flows:
   
   1. Within an integration flow, you can use the ‘File’ adapter to interact with the Embedded File Server.
   2. When configuring the File adapter, select the Embedded File Server as the target or source for reading/writing files.
4. File Operations:
   
   1. You can perform various file operations such as read, write, list, and delete using the File adapter configured to work with the Embedded File Server.
5. Monitor and Manage Files:
   
   1. Use the OIC monitoring tools to keep track of the files and operations performed by the integrations on the Embedded File Server.
   2. Regularly clean up the files to ensure that you do not run out of space, as the storage is typically limited.
6. Best Practices:
   
   1. Use the embedded file server for temporary file storage. For long-term storage, consider using Oracle Storage Cloud Service or another persistent storage solution.
   2. Handle exceptions and errors in your integrations to ensure that unexpected issues do not cause file processing to stop.
7. Compliance with Policies:
   
   1. Make sure that the use of the Embedded File Server complies with your data governance and retention policies.
8. Testing:
   
   1. Thoroughly test the file operations in your integration in a non-production environment before deploying to production.
9. Documentation:
   
   1. Document the integrations using the Embedded File Server, so that maintenance and future changes can be managed easily.