You can select the folders on your DiskStation that you wish to sync to your mobile devices, and make them available for offline viewing anywhere you go. DS cloud also allows you to decide how you'd like to sync: you can set the maximum file size as well as the types of file you wish to sync for each folder. Find out more features about the app on our website: www.synology.com > Solutions > File Syncing https://www.synology.com/dsm/6.1/software_spec/mobile#DScloud