Pin message - Chat

To pin a message, the user has to have PinMessage permission. Here is a list of permissions and defaults in the Permission Resources and Default Permissions sections.
 
Upgrading to a minimum of version 5.1.8 is recommended as this is when permission checking for pinMessages has been implemented.
 
Simply update and use "pin" in your messageActions.
 
messageActions={ ["edit", "flag", "delete", "pin"] }

To show pinned messages, you could create a custom array of messages that filters only pinned messages and pass this to the MessageList component like so:

const customMessages - [
  // array of messages
];

<Chat client={client}>
  <ChannelList />
  <Channel>
    <MessageList messages={customMessages} />
    <MessageInput />
  </Channel>
</Chat>;