Local extras are handled by the ‘Local Media Assets’ metadata agent.
Therefore the right action to perform is ‘Refresh Metadata’ (only on this particular movie, not on the whole library!). A ‘Scan library files’ will not find (correctly named) local extras.
Local extras may still not show up, if
- there is more than one “main movie” file in the folder
- there are 2 or more copies of the movie in the same library (indicated by the “duplicates” icon on the movie poster)
- the folder structure contains more folder levels than just
movies > Movie Title (year) > Movie Title (year) - [1080p].ext
