why .txt files in next.js build of new App structure?

Hey,

I'm using next.js for my static project hosted in S3 bucket, but here when the time of build I'm getting .txt files as well for the every build file {e.g., hello.html and hello.txt). and because of that .txt files I'm getting browser console errors of .txt files. why and how to get rid of this??

app browser build errors every file files frontend hello hey html next next.js project s3 bucket webdev