Upgrade Your Snap-ins Chat Code Snippet to Use More Chat Features

Some of the newly-available chat features work only with the newest code snippet version. To use file transfer and visitor time-out, get more visitor information, and to let users move between subdomains, upgrade your Snap-ins code snippet to version 2.0. This change applies to Lightning Experience only.

You can see if you have the 2.0 version in your code snippet.The code snippet includes 2.0 in various places.