Device Management
You need to add devices to the Mobile Client before you can do further remote operations such as live view and playback.
The devices added to the Mobile Client will be displayed in thumbnail mode or list mode.
Thumbnail Mode
You can tap 
in the upper-left side of the home
page to switch the display mode of the device list to thumbnail mode.
In the thumbnail mode, the video resources are displayed as the thumbnails of their video channel images; the security control resources, doorbells, and access control resources are displayed as device pictures.
List Mode
You can tap 
in the upper-left side of the home
page to switch the display mode of the device list to list mode.
In the list mode, all the resources are displayed as icons with names on the right.