It worked. It doesn't make sense as I was added the timestamp in payload.

This is the timestamp configuration page. 

I am trying to insert data in report suit using Bulk Data Insertion API.CSV file content:reportSuiteIDvisitorIDuserAgentPageUrleVar3eVar4prop9timestampbutterflymarketinglimitedbs23-pocfb_campaign_101Mozilla/5.0https://example.com/pageA1Name-A11112025-09-22T11:00:00.000Zapi response: { file_id: 'e1...