Yeah Puru told me almost a week ago that he was about to implement the new uploading feature (he's been working on an option to replace galleries without having to delete the old one if a decensor or updated translation becomes available, the advantage of this is that it would preserve the gallery comments, ratings, tags, ect.) but not seeing it yet so I guess he only meant implementing it in his test environment.
"Server error 0" is a bit of a catch-all term tbh, it generally means the upload page failed to make a connection with the server that processes new galleries (this rarely ever impacts our access to content already on pending though), this case it was intentional, but 9/10 times it just means Puru forgot to update a link after updating (for whatever reason the upload system needs to point to a new IP every time that server rebooted and he often forgets to do this)