Added a note about XHR Response Handling

website/src/_posts/2018-02-0.24.md

@@ -49,7 +49,7 @@ We’ve also added a handy “cancel” button, which should cancel everything i
 
 ## XHR Response Handling
 
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+When the upload completes (regardless of whether it succeeded), a `response` key gets added to the file. `file.response` contains a `status` and `data` properties. `data` is the result of `getResponseData()`.
 
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