Streaming DS Video Station Outside LAN/home network

[Enquiries]

I have a Synology DS1522+ with Video Station installed. I can stream my videos over my LAN without issue, but when I'm away from home, none of my videos will play.

A pop-up appears that says "Error. The video cannot be played."

I assume there is a setting somewhere I need to change, I just can't figure out what that would be.

[ed]

You may need to check if your videos are h264. Synology recently disabled HEVC (i guess not willing to pay for h265 licence).
Also make sure this is installed https://www.synology.com/en-uk/dsm/packa...os_ver=7.1