Grouping messages in React Native Ui Kit

I need to know how I can group messages in a group channel using react native ui kit and render some text before the start of each group. I want to replicate the demo you at Chat for community | Interactive demos and samples | Sendbird where time of the message start is displayed but I cannot find any documentation of that in react native part. Also I want to know if I can limit upload file types to be only of image and remove the remaining parts