In Box Platform, API calls to Box via a custom application causes the error, "415 unsupported_media_type". This error typically happens with calls related to Box View, Embed Links and Representations.
Box requires a file type extension in order to successfully generate representations of documents.
Steps To Resolve
Ensure that when uploading the file, a file type extension is included in the name. Using a PDF document as an example, TestFile must be uploaded as TestFile.pdf.