Astronomer download from Google Cloud Storage

I have a task (python operator). The task does the following:

  1. Download file from Google Cloud Storage
  2. Do something with the file
  3. Upload another file to Google Cloud Storage

I have 2 questions:

  1. I download the file using the code sample from Downloading objects  |  Cloud Storage  |  Google Cloud
    If I do so, where do I find the downloaded file? So what is the path to the downloaded file?

  2. Where do I set my google cloud credentials?

You can use GCSHook for that purpose