Bring back the file example

@cellear is the original reporter who reported it to the slack channel #examples-module.

jungle → credited valthebald → .

jungle → credited cellear → .

Did a quick look at the form modules/file_example/src/Form/FileExampleReadWriteForm.php. Maybe the issue is the content that gets written should be sanitised,

Automatically closed - issue fixed for 2 weeks with no activity.