Uploading PDF via API succeeds, but file cannot be previewed

Hi,

I'm trying to upload a PDF file to Box from NetSuite - I've constructed the multipart request body (see sample below), and the upload completes, but I cannot preview the file in Box and the file is corrupt when I download it and try to open it locally.

The contents of the file are encoded as a base64 string - I am passing the "content-transfer-encoding: base64" header, but this doesn't seem to be being understood by Box.

I've also tried to send the contents of the file unencoded, which allows a preview of the file, but the pages are blank. I'm thinking this is an encoding issue - what should be the correct encoding? I'm using UTF-8 at present - should this be ASCII?

Any assistance would be appreciated - thanks in advance.

--6070a6fd-0a49-4cc8-b822-5b80342b0074
content-disposition: form-data; name="attributes"

{"name":"testpdffile.pdf","parent":{"id":"0"},"content_created_at":"2021-02-04T10:53:43-08:00","content_modified_at":"2021-02-04T10:53:43-08:00"}
--6070a6fd-0a49-4cc8-b822-5b80342b0074
content-disposition: form-data; name="file"; filename="testpdffile.pdf"
content-type: application/pdf;charset=UTF-8
content-transfer-encoding: base64

JVBERi0xLjUKJeLjz9MKMjYgMCBvYmoKPDwvRmlsdGVyL0ZsYXRlRGVjb2RlL0xlbmd0aCAzNzMzPj5zdHJlYW0KeJzNWltv3DYWfp9fwbcmQKJKpK5b9CFJ0wV2t0m78e4...<data truncated for size>
--6070a6fd-0a49-4cc8-b822-5b80342b0074--

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