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#1
{ [AccessDenied: Access Denied] message: 'Access Denied', code: 'AccessDenied', region: null, time: Thu Nov 17 2016 09:57:14 GMT+0000 (UTC),,,

This is when a file being posted has a space in its name.

Screen1.png is ok.

'Screenshot from 2015-11-12'.png will give the error.