>> [uploaded] https://s3.amazonaws.com/afr-prod/projects/politics/img/maps/Perth.png
Error: Bad status code: 400
>> [uploaded] https://s3.amazonaws.com/afr-prod/projects/politics/img/maps/Sydney.png
Would be nice to know what file got the 400, and if it's retrying or silently failing.
There's a fail event for the latter, but I'll add the file details to the error when it finally gives up :)