So it wouldn’t work with requirements.txt?
Sorry, now that the basics work in MyBinder, I cannot be of much help. I haven’t tried Streamlit. I think that would be a Streamlit issue maybe or that part somehow not implemented in your app in conjunction with the Binder ecosystem? Have you come across any other examples that use file upload that would help?
Are you tied to using Streamlit as your app interface? I have used file upload for Voila apps, see here.