ValueError: Data must not be a string

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When you specify your body to a JSON string, you can no longer attach a file since file uploading requires the MIME type multipart/form-data.

You have two options:

  1. Encapsulate your JSON string as part as the form data (something like json => json.dumps(data))
  2. Encode your file in Base64 and transmit it in the JSON request body. This looks like a lot of work though.

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