I need help for a school project and idk what to do

So basically I'm using flutterflow to make an app, and the app is going to be used by our school nurse to be able to easily access data from her records. The app is meant to show statistics of bmi classifications of the students (normal weight, overweight, underweight).

My current problem rn is idk how to do the part where you're able to upload an excel file to be converted into data. Someone told me I should use buildship but i'm pretty new to coding itself, would really appreciate the help