Limits on source uploads for custom GPTs

I’m building a custom GPT using OpenAI’s platform and would like to know if there’s a limit to the number or size of sources I can upload for reference. Are there any restrictions based on the plan or specific guidelines?

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OpenAI help page explains:

You can use the GPT editor to attach up to 20 files to a GPT. Each file can be up to 512 MB in size and can contain 2,000,000 tokens.

Knowledge in GPTs
https://help.openai.com/en/articles/8843948-knowledge-in-gpts

GPTs
https://help.openai.com/en/collections/8475420-gpts

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