"file" program statement?

MIT App Inventor Help
1

a

Picture above "file"

File a.txt. Display the text of this file on the phone screen.

What program statement is used?

example：

When opening the mobile APP, the mobile phone screen displays the contents of the file a.txt.

2

http://ai2.appinventor.mit.edu.ezproxy.canberra.edu.au/reference/components/storage.html#File

4

grafik