App no reconoce carpetas o archivos de mi dispositivo

[Josue_Miguel]

Estoy desarrollando una app que me permita leer un archivo csv de mi dispositivo y a pesar de haber creado una carpeta y el mismo archivo existe en esa carpeta, la app no reconoce o no encuentra el archivo/carpeta.
He intentado con el identificador archivo colocando directamente la ruta y archivo y no logra reconocer la ruta o archivo de mi dispositivo,

Tampoco reconoce una app instalada (andexplorer) que sirve como explorador de archivo y que utilizo con: ActivityStarter1

Por favor me pueden dar una ayuda como solucionar este problema?
No puedo avanzar con mi app

[patel]

Android version ? see Some basics on Android storage system
Attach please your relevant blocks.

[Anke]

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