Android Question Writing App Generated File to Internal Phone Storage

Hi

I need to write a simple text file generated from within my app to Internal Storage whereby I can retrieve it manually (to print) via any file explorer.
I used to be able to do that but can no longer view the files being saved. They do exist as I tested for If File.Exists(File.DirInternal...... etc
I read somewhere that no phone file explorer can see these files now.
This is such a simple requirement. How can I do it?

Thanks,

Azhar