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FormData_Content_Modifier_Text_File_to_HttpBin
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Package name    : FormData
Iflow name      : FormData_Content_Modifier_Text_File_to_HttpBin
Sender http path: /FormData_Content_Modifier_Text_File_to_HttpBin
Receiver http   : https://httpbin.org/anything

1) Take header Content-Type and body from iFlow "FormData_View (Text File Only)"

2) Set Content-Type and body in Content Modifier

3) Trigger from Postman to see result

4) In Content Modifier body, change file content become properties.