Small coup of document arrangement
Open My Files, select the folder you want to move, press and hold, select Move, and then easily drag to extsdcard.
Photo and video storage settings
For the content shot by the camera/camcorder, you can change the storage path of the SD card in the settings. Turn on the camera/camcorder, click the pinion icon, enter the "Memory" option, and select "Memory Card".
Uninstall software that is not commonly used.
It's time to clean up the dust in the mobile phone! Uninstall some third-party software that is not commonly used to "slim down" the mobile phone.
Restore factory settings
If there is important data in your mobile phone, remember to back it up first! Then try to restore the factory settings and give the phone a brand new start.
Samsung service center
If the above methods can't solve the problem, don't worry, take your purchase invoice, three-guarantee certificate and mobile phone and go to the Samsung service center for testing!