hard bounce is not a field.. it is more of a systematic thing... the bounce is flagged when an email send is attempted and server rejects it with an error message.. based on the error it is flagged as a hard bounce.. in your case, when you upload contacts.. there is an import purpose called "mark as bounceback" .. i think this will do your job of marking them as a hard bounce and my solution in the filter exclude will exclude it from sends.. however, i havent directly used the upload to mark someone as a bounce.. i believe it is not a best practice as well..
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