The actual recomended criation version of the PowerApps in the website (3.24023.14) is not compatible with files (data) and the functions SaveData and LoadData does not work with older versions intalled on cellphones.
The actual last version avaliable in Brazil's PlayStore is 3.24024.10. After update some Apps and publish, my Apps started to show an error message informing that was not possible to load the files storaged in the cellphone.
Now, I have to change the criation version to an older version (older then recomended in the site by default) every time that I need to publish a new version.