Admiral 10" - Can't take screenshot

Tablet: Admiral: 10"
OS: Android 6 - Marshmallow
SD Card: 16GB SanDisk

The Card was formatted as internal memory.

Code:

  Storage & USB    Device Storage  1.21GB  Total used of 27.02 GB    Internal Storage  1.04GB used of 12.80 GB    SanDisk SD Card  182 MB used od 14.21 GB  

I want to take screenshots. But "no memory" is mounted?

Settings » ScreenshotSettings
1. Select delay time to capture the screen
- 15s later capture (shortest time in list)

2. Set location of screenshot storage
- Nand...

Admiral 10" - Can't take screenshot

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