NAS Western Digital

Hello,

How can i install Jelly fin on a western digital nas?

It does somewhat depend on what model NAS unit you have, more specifically what hardware it runs.

Theoretically, if you can SSH into it and install Docker then yes you can install Jellyfin.

Practically, most entry level NAS units (of all brands) are quite low specced hardware, so whilst you can you are probably going to be quite limited in how many streams you can support, and transcoding my be limited or impossible.