Meetora saves all of your chat history, so that you can easily go back and find any messages or files shared with you.
Select the chat under Chats in the navigation panel.
Then click the magnifying glass to bring up the search interface.
Type in the search box, and all messages and files including your search query will be listed below. Click one of them to jump to that message.
Note that you can always clear your chat history in the chat settings but this only clears the history for you. Any other chat participants will still have access to anything shared to that group. If you are the creator of the chat, you can delete the chat instead, which will delete the chat and everything in it for all participants.