upload_file_android.kt

suspend fun upload(uri: Uri) {
    val contentResolver = applicationContext.contentResolver

    val bytes = contentResolver
      .openInputStream(uri)
      ?.use { inputStream -> inputStream.buffered().use { it.readBytes() } }
    checkNotNull(bytes)

    val type = contentResolver.getType(uri)
    checkNotNull(type)

    val fileName = contentResolver.query(uri, null, null, null, null)?.use {
      it.moveToFirst()
      it.getString(it.getColumnIndexOrThrow(OpenableColumns.DISPLAY_NAME))
    }

    val file = MultipartBody.Part.createFormData(
      name = "file",
      filename = fileName,
      body = bytes.toRequestBody(type.toMediaTypeOrNull())
    )

    apiService.uploadFile(
      file = file,
      imageName = ""
    )
  }