United app: dont download for intl flight ck in!

Downloaded app to ck in to intl flight. Scanned passport (yikes, why did I do that?!). Was supposed to take up to 5 min to verify, after 5 min it didnt acknowledge my info, told me again I have to scan my passport to ck in. Now they (third party, whoever that may be) have my passport data and I have no boarding pass. Bad decision on my part to download this app. Can I return it? 74 pages of fine print will answer that question. If only I could take back that scanned image of my passport...

Rational being about United Airlines