You can learn how to write a multi-line message in a post or channel with this wikiHow.
Step 1: You can open it on your phone.
There is a multicolored background with the S icon on it.It can be found on the home screen or in the app drawer.
Step 2: A conversation or channel can be tapped.
In a chat channel or direct message you can type a message that spans multiple lines.To open a channel, tap the team name at the top- left corner of the screen, then tap an option under "Channels".
Step 3: The first line of your message is what you want to type.
Step 4: The key is on your keyboard.
This looks like an arrow pointing to the left.The next line is where the cursor will move to.
Step 5: You can type the next line of your message.
Step 6: Enter with a tap.
If you wish to continue, this opens another line.
Step 7: You can type another line.
As you type your entire message, repeat this process as many times as you please.
Step 8: Go to the send button.
There is a blue paper airplane at the bottom right corner of the screen.Your multiple-line message will show up in the message or conversation.