When I publish an app in the store and then update it, I want the player's data to be preserved
it is
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Its working with the savegame too?
you mean system save? yes
A ok i have tested the function about that, but when i make a update app and install ther not from the play store, the app sends error back...
Not sure what you are trying but if debug apk maybe it thinks it's a different installed app if you change something. You can test save data with the normal preview in construct though!