Upload submission.zip failed immediately

From yesterday this error happen suddenly. I have try different browser, same error.
The error message appear after several seconds:
There was a problem uploading your submission to the cloud. Please try again or contact a competition administrator

If I try to use a proxy, there is no error, the problem is my proxy is slower.

@legend this sounds like it could be an internet issue. We’ve extended the submission upload time, so you should be able to upload large submissions even through a slow proxy. Good luck!