Step by step manual for PickSingleFileAndContinue?

Question

Its about using PickSingleFileAndContinue. As i know its a bit different than the traditional PicksingleFileasync.

Here  you have to suspend the app and continue after file choosing. In that page below is too much information for me. Can an Expert simply write a step-by-step manual for a single file selection please?

https://msdn.microsoft.com/en-us/library/windows/apps/xaml/dn614994.aspx