Messenger Lite has always been capable of receiving GIFs, but prior today they weren't animated in-app. So basically, they were just pictures. Now they will play as intended. Facebook recommends using a third-party GIF keyboard like Google's Gboard to find and send GIFs, likely to keep the Messenger Lite app itself as trim as possible. Users can also send files through the platform by tapping the "+" symbol, selecting the file and hitting send.
In addition to moving GIFs, Messenger Lite now supports most of the customization features that are present in the full-sized Messenger app. Users are now able to change the color of text bubbles in conversations. They'll also be able to give nicknames to the people they are talking to or change the name of a group chat.
Facebook has turned Messenger Lite into a pretty feature-rich service in recent years while keeping the app under 10MB. The lightweight messaging app that is available in over 100 countries got video chat capabilities earlier this year. While the app is primarily targeted at users in developing countries, it's also a less-bulky, data-saving alternative to Messenger for those who aren't interested in playing games or sending Snapchat-style messages.