Hi,
According to the article: Keep it short and sweet: a guide on the length of documents that you provide to Copilot, we can get "For those who love word counts, aim to stay at or below 15,000 words. This is a sweet spot for Copilot to work effectively".
Microsoft is constantly working to expand Copilot's capabilities, and such the character limit will increase over time, the user experience will be improved.
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Thanks for your understanding.
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