You probably know it by the name AllShare Play but Samsung has rebranded that into Link about a year ago. Now, the company also redesigned the app into Link Platform. The Link app is still on Google Play but this features a new look and will obviously get the newer features.
Link Platform is designed to connect your different Samsung devices (TVs, tablets, computers, etc.) so you can easily share data and files between them. Make sure your Samsung account is signed in on all devices to allow for sharing. The app also supports auto-uploads for folders and cloud storage.
Source: Android Police | Download: Google Play Store (Free)