Deferred EA: When and how should I submit an updated common app essay?

Hey everyone!

Hope all is well. I was deferred from Bard early action and wanted to submit a tweaked common app essay: Does this need to be submitted by the regular decision deadline, tomorrow? – my deferral letter only said that my application would be reviewed again in March. Should I submit it through the portal, where there is a space to upload materials, or could I do this on the common app website?

Thanks so much, have a great New Years, and stay cute~~