MiniDLNA is a media server with the aim to be compliant with DLNA/UPnP clients.
Universal plug & play is a set of networking protocols that allow devices within a network such as PCs, TVs, printers etc. to seamlessly discover each other and establish communication for data sharing. It is zero configuration protocol and requires only a media server and a media player that are compliant with the protocol.
DLNA is derived from UPnP as a form of standardizing media interoperability. It forms a standard/certification which many consumer electronics conform to.
To install/enable the media server you need to navigate at MiniDLNA page and enable it. The application is intended to be available in the internal (home) network and therefore it requires a network interface configured for internal traffic.
After installation a web page becomes available on https://<your-freedombox>/_minidlna. It includes information for how many files the server is detecting, how many connections exist etc. This is very useful if plugging external disks with media to check if the new media files are detected properly. If that is not happening, disabling and enabling the server will fix it.
If using an external drive that is used also from a Windows system the preferred filesystem should be NTFS. NTFS will keep Linux file permissions and UTF8 encoding for file names. This is useful if file names are in your language.
http://minidlna.sourceforge.net/ https://en.wikipedia.org/wiki/Digital_Living_Network_Alliance