How upload an attachment to Item using Rest API

Hi Team,

I am trying to use "Upload an attachment" rest API for uploading a file to Item.

https://docs.oracle.com/en/cloud/saas/supply-chain-and-manufacturing/23c/fasrp/op-itemsv2-itemsv2uniqid-child-itemattachment-post.html

I am trying to use below request Payload.

{

"DatatypeCode": "FILE",

"CategoryName": "REQ_INTERNAL",

"UploadedFileName" : "REST Attachment.txt",

"UploadedFileContentType" : "text/plain",

"ContentRepositoryFileShared": "false",

"Title" : "REST Attachment File",

"Description" : "File attachment"

"UploadedText" : "123"

}

I am getting success response, and do see the file under attachments section of Item UI. But it is not actually adding any content to the file attachment when I check it from UI.

Could you please help us on this.