Our engineers have found the source of the issue and it has been resolved.
Posted about 2 years ago. Mar 22, 2016 - 08:32 PDT
Currently, we've identified an issue with previewing documents via the Content API - document previews are not generating successfully for requests made through the Content API. Our engineers are engaged and investigating.
Posted about 2 years ago. Mar 22, 2016 - 06:58 PDT