https://www.wintips.org/how-to-map-synology-nas-drive-outside-the-local-network-over-internet/ To map a specific folder on you NAS server, type: https:// ddns-address-name :5006/ Shared-Folder-Name OR \\ ddns-address-name @SSL@5006\ Shared-Folder-Name * Notes: 1. Replace the ddns-address name , with your Synology's DYNDNS web address (e.g. example.ddns.net). 2. Replace the Shared-Folder-Name, with the name of the shared folder you want to access in the NAS Server. e.g. If you want to map only the shared folder named "Public" on your NAS Server with DYNDNS Address "example.ddns.net" , type: https://example.ddns.net:5006/ Public