Support for .ISO file

Feature Suggestions
1

Ability to read and use .iso’s that contain Bluray/DVD structures with menus, bonuses, etc. directly from the Plex clients.

2

I’m sorry this is not something we are ever going to do. Closing this to give your vote back

More info in link below

https://support.plex.tv/articles/201426506-why-are-iso-video-ts-and-other-disk-image-formats-not-supported/