Sorry to jump on an old thread, but Google pointed me here. We’re having the same problem. We have six image sizes. When uploading an image we are getting 403 response from GCS, for all sizes. When regenerating the image, either by using “Regenerate and sync with GCS” or by using smushs “Restore” and then smushing the image again, all the image sizes are created in GCS.
Did you guys solve the issue?
