Movie Extra names

Hi all,

I have tried to find this in the wiki and forums but no real success.

I have My Movies configured for Plex.

As such my movies are named in the following format.

/Movies/War/Saving Private Ryan (1998)/Saving Private Ryan (1998).mkv
/Movies/War/Saving Private Ryan (1998)/folder-1.jpeg
/Movies/War/Saving Private Ryan (1998)/Saving Private Ryan (1998)-Extras
/Movies/War/Saving Private Ryan (1998)/Saving Private Ryan (1998)-Extras/Making-off-featurette

And so On.

What should I call the extra files in Kodi?

Adrian