multi-part request (uploading an Image) with Retrofit2

Apis.kt

interface AppAPIs {
  @Multipart
    @POST(APIEndPoints.UPLOAD_PHOTO)
    fun uploadTempProfilePic(
            @Query(APIEndPoints.ID)
            tempId: String,
            @Part
            image: MultipartBody.Part
    ): Flowable<PhotoUploadResponse>
}

SomeFragment.kt

fun uploadAnImage() {
  val requestFile = RequestBody.create(MediaType.parse("image/*"), imageBytes)
  val multiPartBody = MultipartBody.Part.createFormData("content", "profile.jpg", requestFile)
  
  viewModel.uploadTempProfilePic(
                tempId,
                multiPartBody
        )
}