Below is a step-by-step instruction on how to do that. But you can use ExaGear Desktop, that provides standard Linux x86 environment on top of Raspbian, and install Plex Media Server there. There is no official version of Plex Media Server for Raspberry Pi.

Additionally, the web control panel of the Plex Media Server provides intuitive graphical access to media content, that helps you organize your media files in Plex libraries and manage your media content.

You can keep media files in the local directory on Raspberry Pi or in a mounted directory, for example on NAS, that is in local network with Raspberry Pi. A power-efficient Raspberry Pi device is good for this purpose. Plex Media Server needs to be up and online all the time to let you access your media content anytime from anywhere. In this article we will tell you how to use ExaGear Desktop to run Plex Media Server on your Raspberry Pi, so that you could store and manage your media files (movies, pictures and music) and stream them to any of your devices (phone, tablet, smart TV, PC etc) with Plex App.

Pi plex server