Nokia Lumia 928 - What is Lumia Share app?

Lumia Share is an application that allows you to access your Lumia phone's photos and videos from the Storyteller application on your Lumia 2520 Tablet.

The Lumia Share app will enable you to establish local Wi-Fi connectivity between a Lumia phone and a Lumia Tablet. It also supports automatic re-pairing. Once the initial pairing is done and the devices come to the same Wi-Fi network, connectivity is established automatically between them. 

Note: Transfer activity from phone to tablet utilizes 3 components, Lumia Storyteller on the tablet, Lumia Share and Extras+Info (settings app) on the phone.