Return a 503 when media uploads fail. #361
Draft
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Using a 503 here so clients will know that this can be retried. The use-case here is when encountering closed connections or other issues uploading to S3, which appears to be relatively common (~0.1% of uploads-ish).
NOT happy with the approach here though, a blanket switch in status code seems wrong but I'm not sure on the best approach here to separate internal errors from upstream ones, hence the draft PR.