How the concept of Offline POD works?

Thanks for your reply. Lets say i have an app in PC which makes use of a POD from solid community. I also downloaded the POD locally to provide the offline support. But in the app when i make a reference, i usually refer to a file using URI. How can this be solved? possible to use any mapping table?

One more question, Is it possible to access a POD from an android app? I want to create a mobile application which can store data to a solid POD. I am not sure how to implement the solid auth client and the file manager.