I recently "upgraded" the storage (a week ago) from a Google Compute Engine attached drive to a Google Cloud Storage bucket. In theory, it is supposed to be highly scalable, but obviously there must be some subtle misconfiguration that is causing intermittent failures, as I see uploads working for some users... I'll have to investigate more
I've fixed it again, thus solving the problem once and for all
All previously uploaded images are still available on a storage bucket (but with a corrupted index file), so if anyone wants to try to reconstruct things at their own peril, they can reach out to me for access...