Why can't Apple phones send handwritten messages and show timeliness?

The time-sensitive processing method that the handwritten information of Apple's mobile phone can't be displayed is as follows.

1. Open the information settings in the system settings.

2. After entering the information settings, find the imassge function and select Open.

3. After opening the imassge function, return to the interface of sending information, and click the exclamation point behind the information to send successfully.