Go to phone settings.
Go to applications.
Go to mcpe.
Clear all data.
Turn phone off.
Restart phone.
Open app and log on.
English
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That's going to get rid of all your worlds
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It doesn't cloud save? If you have to log in to use app it should have cloud storage. If not, that maybe why it crashes, it's intensive, and fills up the cache with data.
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I don't think it does so automatically. I would know though, I didn't have cloud at the time