Rest connector

Hi Gurus,

I’m configuring a REST API which have format as multipart/form-data.
I created parameter where type put as above.

When tested with operation designer , it shows me below error.

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Warning: Missing boundary in multipart/form-data POST data in Unknown on line 0

So where to put boundary because when I call it in postman it shows
multipart/form-data; boundary=

Any help is appreciated.

BR,
Bhaskar