This is a simple flow that allow you to ask questions about the content of a PDF file and get answers. You can run the flow with a URL to a PDF file and question as argument. Once it's launched it will download the PDF and build an index of the content. Then when you ask a question, it will look up the index to retrieve relevant content and post the question with the relevant content to OpenAI chat model (gpt-3.5-turbo or gpt4) to get an answer.