As an agent, you can share all types of images and pdf documents in a conversation (chat), WhatsApp or Messenger, by clicking on this icon 
To know more about this feature, please read this article : Sharing a file.
It is possible to add pre-recorded responses (canned responses), which enable you to respond more quickly to visitors' frequently asked questions, by clicking on this icon 
To know more about this feature, please read this article : Create pre-recorded (canned) responses.
These suggestions are adapted to the context of the conversations and extracted from the conversation history.
When relevant suggestions are available, the Smart Responses icon is activated on the conversation at the bottom of the compose box 
To know more about this feature, please read this article : Use the Smart Answers
6.1 Offers
An offer is a pre-formatted message that you can send to your customer by chat. An offer is a unit consisting of a text message, a picture and a hyperlink.
To know more about this feature, please read this article : Create pre-recorded offers
6.1 Links
During discussions with your visitors, you have surely needed to transfer a link to a product sheet or your terms and conditions. Rather than copy/pasting the link into the discussion, we suggest pre-recording it.
To know more about this feature, please read this article : Create pre-recorded links
During a conversation with a visitor, you may need to translate the messages in his/her language. To activate the translation tool, please on the button 
To know more about this feature, please read this article : Translate your messages to visitors
Use the Smart Answers