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Description
According to the rest api, the bytes should be submitted as the body of the PUT: https://developers.docusign.com/docs/esign-rest-api/reference/envelopes/envelopeattachments/create/
Looking at the code, there's no way to pass the bytes in the method parameters and it's just set to "{}".
So when you call it, you get the error:
Error while requesting server, received a non successful HTTP code 400 with response Body: '{"errorCode":"FORMAT_CONVERSION_ERROR","message":"The data could not be converted. The document is empty."}'