Rest Receivables invoice attachment with postman OK, with OIC does not work (for me...)

Summary:

Hello,

I would appreciate your help with this issue:

I use postman with this payload:

https://egyp-test.fa.em3.oraclecloud.com/fscmRestApi/resources/11.13.18.05/receivablesInvoices/5267561/child/attachments

{

"DatatypeCode": "FILE",

"FileName": "xx.zip",

"CategoryName": "CUSTOMER_TRX",

"UploadedFileContentType": "application/zip",

"FileContents": "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",