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(Key) effectiveStartDate: in Unix EPOCH time format
(Key) externalCode: employee's user ID
cust_attachmentNav
link to entity Attachment (with attachment ID 7447)
Response Message
9. Check in People Profile
Using Postman to send OData queries is only for proof-of-concept purpose and in real project, you may use other programming language to develop a end-to-end process scenario.
Reference:
SAP KBA 2599554 - Odata attachment upsert to custom MDF Object not reflecting attachments in UI
SAP SuccessFactors HCM Suite OData API: Reference Guide