Does anyone know how Notion (and other tools) do the summarizer and find action items on really long documents, on GPT3? Do you have to chunk up the text into

Does anyone know how Notion (and other tools) do the summarizer and find action items on really long documents, on GPT3? Do you have to chunk up the text into little bits and run the same prompt? How does it know to "Remember" the previous sections with a summarizer?