@ManivannanR17190210 To store and retrieve case attachments in/from an on-prem warehouse, you can use the document warehouse’s API to manage the actual file storage. When an attachment is uploaded in the case, store only the metadata (e.g., document name, type, and reference ID) in your Pega case, linking it to the document. For the file itself, use the API to send the attachment (the blob) to the on-prem document warehouse, which will handle the file storage. When retrieving attachments, Pega can use the metadata to fetch the list of attachments associated with the case, and for each, make an API call to retrieve the document from the warehouse. This approach keeps the case data lightweight while storing large files externally, ensuring efficient management of documents and attachments.