Can only encode [String: Part] with MultipartEncoder. Got ContentValue instead

[Nielsb85]

I have to send a file together with some string parameters

In my protocol I have the following:

    @Multipart()
    @Headers(["Content-Type": "multipart/form-data"])
    @POST("/api/chat")
    func post(body: Body<chatBody>) async throws -> Void

my body looks like this

struct chatBody: Codable {
    let image: Part
    let msg: String
}

It seems like I am not able to send any other then Part type on a Multipart() request

I get the error

Fatal error: Can only encode [String: Part] with MultipartEncoder. Got ContentValue instead