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Not deleting locally stored data after main mobile app update

Sometimes/everytime microsoft release a new version of the main app on my mobile device, all the locally stored data using SaveData() seems to be gone.  Is this absolutely necessary?

 

This is not ideal for situations where weeks of survey data has been collected and a user hasn't been able to connect to the internet.  When they connect and the main app updates before they open my app, the data isn't there!

 

I am also storing an authentication guid and don't want users to have to re-scan when the app updates.

Status: New