Each breakout room has its own chat, and all of the chats are available in your main Teams chat list. When the breakout room closes, you will still be able to view the chat history and any shared files. Now, you could share the content to others.
The meeting organizer has access to all content of breakout rooms. So, he/ she can put all the contents together and share with you in the main meeting chat.
For more information, please refer to this article.
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