How to access namespace available in client project from a referenced dll

I am developing a .net standard library( lets say Sample.dll) . I am planned to access it from different projects like UWP, WCF etc.. Here My problem is I would like to access file storage in different applications, so I would like to access a namespace which is available in application , which used my .net standard library dll.

1) My .net standard library 2.0 is Sample.dll 2) My UWP app is MyNewUwpApp, which has Windows.Storage namespace 3) MyNewUwpApp added Sample.dll in its reference. 4) I would like to access "Windows.Storage" namespace, which is available in MyNewUwpApp at runtime , from my Sample.dll.

Kindly anyone help me to solve this.

Thank you.

Noorul.