Describe the bug
I tried to integrate the dalle-3 example code to my groupchat bot, (https://github.com/microsoft/autogen/blob/main/notebook/agentchat_dalle_and_gpt4v.ipynb),
but after the dalle agent replied with img data in base64 format, the next request encounter an error sad request data too large.
I think it's because the autogen push the reply data of base64 img to message list, in the next request, there will be a large request body.
How to exclude some message or truncate it in the group chat?

Steps to reproduce
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Expected Behavior
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Screenshots and logs
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Additional Information
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