Multipart request with few parameters

[SilverPlate3]

I don't think the following can be done:
I have an API request I need to do
curl -X 'POST'
'https://www.hybrid-analysis.com/api/v2/quick-scan/file'
-H 'accept: application/json'
-H 'user-agent: Mozilla 5.0'
-H 'api-key: p36a6qk6119e21dfxf2repsy918df0b2mt5cifpra922df944eg2iim292b1f961'
-H 'Content-Type: multipart/form-data'
-F 'scan_type=all'
-F '[email protected];type=application/pdf'

Because the Multipart takes two (at least) parameters I couldn't find a way to do it. Went through the full multipart documentation files.

I always get the error :
"{"validation_errors":[{"field":"scan_type","errors":["This value should not be blank."]},{"field":"file","errors":["This value should not be blank."]}],"message":"Input data validation has failed. Please check 'validation_errors' field to get more data."}"

You can see in the attached file some lines of my code (only the important ones)

Multipart.txt

[Avots]

Hi!
I have the same problem!
I need to pass some parameters and 2 images, and what arrives on the server are the blank parameters.
Can you help me with any solution?

Task<HttpResponseMessage> UploadImage(
    int id, int typeId, int orderId,
    [AliasAs("photo")] ByteArrayPart bytesPhoto, [AliasAs("thumbnail")] ByteArrayPart bytesThumbnail, 
    [Header(AuthorizationHeader)] string authorizationHeader);