Upload component while deploying on Heroku

Hi. I am making a Dash app and was deploying it on Heroku. The app generates graphs on the basis of data uploaded. While running on the local server, the app works fine. But when I deploy it on Heroku and Upload the files, nothing happens at all. The files are in .csv or .xlsx format.

Can somebody help me out?

What does your Heroku logs say?

Hi ! I figured out the error. Heroku had installed the latest version of Dash (1.0.0) while I was still using the old one in the requirements file. So it worked when I updated it.

Although it’s working, the app is pretty slow. Do you know the reason why and how to fix this?

Thank you! Appreciate your help!