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The mobile phone will erase the memory. What is the blue file? It's huge. How to clear it?
Files such as photos or a large number of documents will take up a lot of space if there are many photos. At present, it takes about 3~8MB to take a photo with a mobile phone, and a thousand photos will take up several G spaces.

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Meizu's mobile phone slimming has ruled out the space occupied by system files and applications, so there are too many data that can't be deleted by mobile phone slimming, most likely a large number of small documents and photos.