Photo Previewer APP
Works best and designed to cooperate with LumixSYNC but can work with any other wireless tethering app.
First you connect a camera with your smartphone via LumixSYNC and allow auto-transfer, than you start Photo Previewer up and select LumixSYNC folder to monitor. After this you have an ability to see last photo to zoom it or to swipe to previous photos.
It makes a photo-session much easier when working over every detail and you don't want any cables getting in a way!
Enjoy!