Namespaces
knownFolders
Provides access to the top-level Folders instances that are accessible from the application. Use these as entry points to access the FileSystem.
Summary 
Namespaces
Functions 
currentApp 
documents 
externalDocuments 
externalDocuments(): Folder
Gets the Documents folder available for the current application on an external storage. This Folder is private for the application and not accessible from Users/External apps.
On android this requires READ_EXTERNAL_STORAGE/WRITE_EXTERNAL_STORAGE permissions
There is no external storage on iOS os it is the same as 
`documents()` Returns Folder