using Berlin 10.1.2 i made an iOS app. With your FMX Cloud Pack it has Dropbox storage access.
web view, instead of the system browser. In order to support the Google Sign In
flow when signing in to authorize the Dropbox app, your app will need to be
updated to use the system browser, in order to comply with Google's policy: https://developers.googleblog.com/2016/08/modernizing-oauth-interactions-in-native-apps.html