I apologize for the inconvenience, let's see what's causing the problem! The device is working as designed. Here's a workaround:
•To manage other folders/files,connect device to PC directly, and manage files by PC file manager
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If the device were working as designed there would be no need for a workaround. Clearly, the original design was for the device to use an SD card to expand its already low amount of drive space-which is one of the reasons I bought the device.
Android came along with an update that you are not fully supporting: you should either let us back rev the android update to restore the as design functionality or provide us with a file manager that can read, right and delete to the SD card (as I personally know Samsung has done).
You need to take responsibility and provide proper customer service.