How to persist chatbot messages, plots, and inputs in Streamlit without them disappearing?

Using Streamlit
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Hi everyone,

I’m building a chatbot app in Streamlit and I’m facing an issue: every time a new interaction happens (like submitting an input), the previous messages, charts, and inputs disappear from the page. I’d like everything to stay visible on the page, like a real conversation history, even after new inputs are added.

Here are some details about the app:

  1. The chatbot is designed for forecasting, using three different machine learning models (e.g., RandomForest, SARIMA, ETS).
  2. It asks the user a fixed sequence of questions, processes the answers, and uses them as inputs to the models.
  3. After gathering all inputs, it should show a bar chart with the forecasts and provide an option to download the results as an Excel file.

How can I make the chatbot messages, plots, and widgets persist on the page after each new user input?

Any help or examples would be appreciated!

Thanks in advance!