“I have yet to find a way to EXPORT them back to your local system”
Fortunately it seems doable BKM - these pages explain how to download to your local an ‘object’ from a Google Cloud Storage ‘bucket’:
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export your custom image file to a Google Cloud Storage ‘bucket’
Export a custom image to Cloud Storage | Compute Engine Documentation | Google Cloud -
download that ‘object’ from the ‘bucket’ to local
About Cloud Storage objects | Google Cloud
Some restrictions apply for eg. only Chrome browser support, no Windows images
As well you may need command line access!? This page states ‘The Cloud Platform Console enables you to perform basic storage management tasks with your data using a browser’
You are now the resident expert…