Dash long_callbacks, Tutorials

Hi everyone,
Please Can you suggest me about advance topics of long_callbacks and explanation?
I want to know about multiple inputs.

Check out Long Callbacks | Dash for Python Documentation | Plotly


Thank you for answer but in documentation topic doesn’t explain more detailly and also libraries are old. If you suggest another one I will be satisfied

Could you explain what you need help with?

I want to create program as that when you upload files you can check list and if you need delete them. I have did all this but i cannot delete file name as well as files. Please help with that.
This is a file of my code