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Apps Data Storage between updates -- help!

the Baron

Lurker
My app creates a File in internal storage that saves object data from user input. The users can see the saved data via the app GUI every time they open the app. The problem is that when I release an update to the app and users install the update, all the saved data is erased.
Is this an issue with internal data storage or am I doing something wrong? Should I be using a different data storage method like external or sqlite to keep data saved between updates?
 
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