How does Xiaomi mobile phone save short messages to the draft box?

When Xiaomi's mobile phone suddenly doesn't want to enter a short message, click the back button to automatically save the short message to the draft box. The following is a validation analysis.

1, open SMS.

2, click on the recipient

3. Click the back menu to automatically save to the draft box.

4. Pay attention to the words stored in the draft box.

Through the above steps, Xiaomi mobile phone can save the short message to the draft box.