Adding "knowledge" to a GPT

I am confused about how to add "knowledge" to a GPT. Does it accept pdfs, epubs? Does anyone have any information on how to use this feature?

I am trying to get it to learn a particular editing system (Story Grid by Shawn Coyne). There are a lot of free articles based on this system...but they are all blog posts, not PDFs. It's not a problem to create PDFs of the article, but it would be nice to train the GPT on specific blog posts. Has anyone done this?

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