class ActiveStorage::Service::AzureStorageService

def download_chunk(key, range)
  instrument :download_chunk, key: key, range: range do
    _, io = blobs.get_blob(container, key, start_range: range.begin, end_range: range.exclude_end? ? range.end - 1 : range.end)
    io.force_encoding(Encoding::BINARY)
  end
end