Postman with a file and json object in same request as multipart

Dear team,

How can I send a multipart postman request containing a file and a json object like this?

Content-Type: multipart/form-data; boundary="----=_Part_2dfwfwerwe"
Content-Transfer-Encoding: binary
Content-Disposition: form-data; name="metadata"
Transfer-Encoding: chunked

Content-Type: multipart/form-data
Content-Transfer-Encoding: 8bit

"documentko": {
"userId": "XXXXXXXX",
"imageko": {
"fileFormat": "PDF"

Content-Type: application/octet-stream; name=
Content-Transfer-Encoding: binary
Content-Disposition: form-data; name="document"; filename=""

14 0 obj
<</Linearized 1/L 11984/O 16/E 5003/N 2/T 11672/H [ 446 157]>>

20 0 obj
<</DecodeParms<</Columns 3/Predictor 12>>/Filter/FlateDecode/ID[<(HNLIHJBKILN879y9uy98uiuHHBHJB78yu>]/Index[14 9]/Info 13 0 R/Length 44/Prev 11673/Root 15 0 R/Size 23/Type/XRef/W[1 2 0]>>stream
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When I trying I receive a message like this:

"RESTFaultCode" : "rest:Server" ,
"Reason" : "WebService Processing Exception" ,
"detail" : "Invalid request"

Thanks you!