H1B/H4 Dropbox procedure – Hyd Consulate

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This is the first time me and my wife will be using Dropbox for visa stamping. Just wanted to know the procedure. Do we carry our documents individually or all of them together in one folder? Do we need to carry originals and 1 copy? Do we need to carry scanned copies in a flash drive? Can we submit any/all supporting documents or just the ones specified in the confirmation email?

Thank you.