Multipart movies do not play 2nd part

Not what you’re looking for… but:

From https://support.plex.tv/articles/naming-and-organizing-your-movie-media-files/

Movies Split Across Multiple Files

Notes :

  • Not all Plex apps support playback of stacked media


However, to get a better overall experience, we encourage you to instead use a tool to join/merge the individual files into a single video. There are multiple ways you can do this and a quick search in your favorite search engine should give you some options on how to “join” files. An unofficial guide with one free tool has even been posted in our forums.

Related Page : Forums: Joining multi-part movie files with MKVtoolnix GUI