Format SD Card on Samsung Galaxy M31
All data (images, videos, documents, files etc.) on the memory card is deleted with “Format SD Card on Samsung Galaxy M31” or “Format Memory Card on Samsung Galaxy M31″ process. Do not forget! Deleted data will not come back.

1 – Firstly tap “Settings” option from menu.

2 – And then touch “Device care” from options on Samsung Galaxy M31.

3 – Select “Storage” option on next screen.

4 – Then tap 3 dot on this screen.

5 – Touch “Storage settings” option.

6 – You will see SD card on the screen if the Samsung Galaxy M31 phone has an SD Card. If you see an SD Card, tap “SD card”.
NOT: If you do not see an SD card on this screen, the SD card is not compatible, not inserted correctly or is corrupt.

7 – And then “Format” option on next screen.

8 – A warning screen will appear. Read this warning screen carefully and tap “Format” to continue on Samsung Galaxy M31.

9 – Finally touch “Done” option.

10 – Format SD Card process is over
So all the data on the SD card has been deleted on Samsung Galaxy M31.
We have answered the this questions in this post:
How to format the memory card on a Samsung phone?
How do I format an SD card in my Samsung phone?
Can I format my memory card on my Samsung phone?