Upload large files in Angular 2 or more and download files

Upload large files in Angular 2 or more:

For reference: 

https://stackoverflow.com/questions/60182054/upload-large-files-using-angular-8-and-net-core-web-api

download files:

https://stackoverflow.com/questions/35138424/how-do-i-download-a-file-with-angular2-or-greater