File upload as octet-stream

I have one site that post files as application/octet-strean and another as multipart/form-data; boundary=------------------------4670cb189fc16a30 they are on 2 different servers but I dont know what would cause it to work differently
It should be the multipart/form-data
I use curl for a test curl -v -F ‘[email protected]https://domain/
curl verbose says it uploads as multipart/form-data but the server side has $_SERVER[CONTENT_TYPE] => application/octet-stream
any idea what cloudflare uses to determine how to upload?

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