Where is the expression pack of Apple's mobile phone?

There are many users who like to chat with characters, so where are the emoji of Apple's mobile phone? Let's take a look ~

Where is the emoticon pack for Apple's mobile phone 1? Open the message, click the edit icon, and click the expression icon in the menu bar below the input box.

2. Select the expression to send, and then click the send icon.

This paper takes Apple 13 as an example and applies it to ios 15 system.