How to turn a portable SD card into internal storage via ADB command?

This allows you to format the microSD card as internal card when your phone manufacture (like Sony) wont let you.
You must be at least at Android 6.0 (2015) or newer.

1. 
   $adb devices
   $adb shell
   XQ-BT52:/ $ sm set-force-adoptable true
   XQ-BT52:/ $ exit
   

2. Go to Settings > Storage > SD Card > three-dot menu > Storage settings > Format as internal > Format SD card.

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