Created Folder and Files using Filesystem are hidden in nativescript angular2?



I have followed the Filesystem instructions and created the Folder, File with content.
These are created inside app installed folder but I can’t able to locate the folder/file in device’s Filemanager.
My questions are,
1.How shall i access the Folders and Files that i have created inside filemanager of device?

2.If i want to create the folder and files in outside of app installed directory or anywhere means how shall i achieve?

FYI, Please find screenshots-

Thank you for reading, looking forward to reading your responses!