<p>I don’t think it’s worth worrying about; the supplement wasn’t marked as “downloaded” on either of my early apps (to other schools) but the status checks from the schools themselves said that it was received. Why don’t you check the application status?</p>
<p>Stanford should have e-mailed you with access through Stanford’s website to where you could track what they’ve received. I would check there as that should be more reliable than the Common App.</p>