How to add missing actor

First:

Second:

Name it:

The Redhead and The Cowboy (1951)

Third:
Refresh Metadata

and if that does nothing…:

Forth:

Name your files correctly and Plex goes to TMDB/IMDB and gets the cast list and those actor images. There currently is no other way to get Actor Info other than through Matching.

(You can ‘Fix Match’ - under the dots on a Movie’s Preview Page)
(Deploy proper naming and you won’t have to Fix Match every time you add something)