File does appear in bucket. it take more than half hour for all activities of start up script to complete. I just did lab twice. first time even i thought there is some issue and file does not appear as mentioned in lab. However second time around i kept looking at stackdriver log and observed all the logs and found that it take atleast 30-45 minutes for start up script.
Please try again and wait it out 🙂
I had a different experience. My instance took a couple minutes to start and the file showed up in my bucket within a few seconds after starting the instance. Make sure to look at the script and then add the right metadata key/value for your bucket when creating the instance. My first time didn’t work because I missed adding the metadata information when creating the instance.