The Elmedia Player Library includes all media files and folders that you added from shared computers and file servers on your network, including Mac and Windows computers that have file sharing turned on and servers that use SMB. 
The Library provides a single aggregated view of multiple folders and their contents. It stores references to your files, rather than the files themselves, meaning that none of them are actually copied to your Apple TV. You can think of the Library as a collection of shortcuts to files stored elsewhere.
While you can’t edit photos and videos on your Apple TV, you can edit them on a computer and have those changes automatically updated on your Apple TV.
For detailed information on adding files to the Library, please refer to this user guide.
Browsing the Library
To navigate the Elmedia Player Library, use the Touch surface and buttons on your Siri Remote.
On the left-hand sidebar on the main screen, swipe to one of the media categories – Videos, Music or Photos – and select the category you want to browse. Swipe up or down to scroll through the items in the selected category. To browse folders, highlight a folder and press the Touch surface to view it. Select a song or movie to play it.
The Library provides a single aggregated view of multiple folders and their contents. It stores references to your files, rather than the files themselves, meaning that none of them are actually copied to your Apple TV. You can think of the Library as a collection of shortcuts to files stored elsewhere.While you can’t edit photos and videos on your Apple TV, you can edit them on a computer and have those changes automatically updated on your Apple TV.
For detailed information on adding files to the Library, please refer to this user guide.
Browsing the Library
To navigate the Elmedia Player Library, use the Touch surface and buttons on your Siri Remote.
On the left-hand sidebar on the main screen, swipe to one of the media categories – Videos, Music or Photos – and select the category you want to browse. Swipe up or down to scroll through the items in the selected category. To browse folders, highlight a folder and press the Touch surface to view it. Select a song or movie to play it.