Ktor Client. How to send byteArray using multipart/form data

SendMultipart.kt

import io.ktor.client.HttpClient
import io.ktor.client.call.call
import io.ktor.client.engine.okhttp.OkHttp
import io.ktor.client.request.forms.MultiPartFormDataContent
import io.ktor.client.request.forms.formData
import io.ktor.client.request.url
import io.ktor.http.Headers
import io.ktor.http.HttpHeaders
import io.ktor.http.HttpMethod
import kotlinx.coroutines.GlobalScope
import kotlinx.coroutines.launch
import kotlinx.io.streams.asInput

class SendMultipart {

    fun sendBytes(url: String, imageBytes: ByteArray, fileName: String) {
        GlobalScope.launch {
            val result =
                HttpClient(OkHttp).call {
                    url(url)
                    method = HttpMethod.Post
                    body = MultiPartFormDataContent(
                        formData {
                            append(
                                "document",
                                imageBytes,
                                Headers.build {
                                    append(HttpHeaders.ContentType, "images/*") // Mime type required
                                    append(HttpHeaders.ContentDisposition, "filename=$fileName") // Filename in content disposition required
                                }
                            )
                        }
                    )
                }.response
        }
    }
}