That’s why there’s an option to use subfolders per extra type. You don’t need to keep all the extras inside the show folder, each with the extra suffix. That being said… you might even want to move those season extras to their respective seasons.
Known issue. I believe Plex are working on that one, though no eta.
I’m glad it worked for you. It didn’t work for me. Since updating to 1.23.1.4528-6000 (installed on Synology DSM) the scanner no longer recognises any extra TV shows.
I use the naming convention:
S00E100 Deleted Scenes Season 1.mp4
S00E101 Deleted Scenes Season 2.mp4
S00E102 Deleted Scenes Season 4.mp4
S00E103 Outtakes.mp4
S00E104 This is getting boring now.mp4
and up until this update, these additional files were scanned and recognised by PLEX and appeared in the Specials folder, next to Season One, Two, Three etc.
Now with this latest update, this naming convention isn’t recognised, and therefore these extra files don’t show up in PLEX!
Very annoying.
PS - the older files that use this naming convention (ie hundreds of Doctor Who 1963 bonus episodes) are still showing up in PLEX.
What to do?
That part’s got nothing to do with the kind of local extras we’ve been discussing here. Using the new “Plex TV Series” scanner/agent you can now actually add that kind of extras to the related show, season or episodes.
That being said – if you follow the naming schema, Plex should still recognize your specials and list them as “Episode 100”, “Episode 101” etc.
Given those are mp4 files… have you verified the files aren’t added but mismatched to a different show / existing episodes? mp4 files can be tricky if they have embedded metadata that contradicts your regular file names. Also keep in mind you should keep the show’s name in the name of those episodes (e.g. Doctor Who > Specials > Doctor Who - s00e100 - Deleted Scenes Season 1.mp4).
If you opt to switch your library to the new agent, you can name/structure those episodes like this alongside your regular episodes:
TV Shows <- the folder linked to your tv-show library
Doctor Who
Season 01
Deleted Scenes
Deleted Scenes.mp4
Season 02
Deleted Scenes-deleted.mp4
Season 04
Deleted Scenes
Name of the scene.mp4
Behind the Scenes
Outtakes.mp4
This is getting boring now.mp4
Hi tom80H,
Thanks for the reply.
I should have been more concise. I was also referring to “local extras” but I incorrectly said “extra TV shows”.
The files did have some metadata in there, which I totally stripped prior to copying them to my TV Show Media folder, so that rules that out.
I did try keeping the names of the show in the file name, in fact I tried a bazillion permutations of file names, as well as keeping them in the root directory of the show, and then adding a subfolder and trying different folder names as well. eg:
Black Books S00E01 Series One Outtakes.mp4
S00E01 Series One Outtakes.mp4
Series One Outtakes.mp4
S00E01 [Outtakes].mp4
etc…
and none of them were recognised by Plex, nor showed up in any other TV show.
Which is weird because all my Doctor Who episodes are in this format:
Doctor Who S14E01 - The Masque of Mandragora 1080p.m2ts
Doctor Who S14E02 - The Masque of Mandragora 1080p.m2ts
Doctor Who S14E03 - The Masque of Mandragora 1080p.m2ts
Doctor Who S14E04 - The Masque of Mandragora 1080p.m2ts
and the extras (in the same folder)
Doctor Who S14E101 - The Masque of Mandragora Extras - Making of Documentary - The Secret of the Labyrinth 1080p.m2ts
Doctor Who S14E102 - The Masque of Mandragora Extras - Behind the Sofa 1080p.m2ts
Doctor Who S14E103 - The Masque of Mandragora Extras - Audio Archive - Tom Baker.m2ts
etc…
and PLEX recognised them totally fine.
[Admittedly the Doctor Who files were added months ago, so who knows what PLEX would do if they were a fresh import now]
What changes should I make to my library, ie agent, scanner etc?
Extras != Specials
According to the official policies of most online databases (e.g. TheTVDb.com or TheMovieDatabase.org), specials should be special episodes but not DVD extras. TVDb are a bit more strict about that than TMDb – though there’s shows on both that throw their extras into the specials.
Naming your files like those Doctor Who files should do the job. Just follow the common naming schema for tv-shows.
TV Shows <- the folder linked to your tv-show library
Black Books
Specials <- or "Season 00"
Black Books - s01e01 - Series One Outtakes.mp4
Black Books - s01e02.mp4 <- no need to include the episode title in the file name
Black Books - s01e03.mp4
Black Books - s01e04 - Black Dolls.mp4
...
As always when it comes to regular episodes, Plex will not recognize simple file changes as a basis to re-match your files. If you got those names wrong and Plex mismatched the files at first, perform the following steps:
Specials folder outside the folder linked to your tv-show library⋮ > Scan Library Files
⋮ > Manage Library > Empty Trash
⋮ > Scan Library Files
This will only work after you upgraded your library to the “Plex TV Series” scanner/agent!!
Local extras work similar as for movies. You can place those extras either inside a subfolder per extra type or add a suffix to the file name that identifies it as extra.
TV Shows <- the folder linked to your tv-show library
Black Books
Scenes
Bernard's Letter.mp4 <- show level extra of type "scene"
Season 01
Behind the Scenes
Series One Outtakes.mp4 <- season level extra of type "behind the scenes"
Season 02
Behind the Scenes
Series Two Outtakes.mp4 <- season level extra of type "behind the scenes"
Deleted Scenes
Series Two Deleted Scenes.mp4 <- season level extra of type "deleted scene"
Season 03
Behind the Scenes
Series Three Outtakes.mp4 <- season level extra of type "behind the scenes"
Deleted Scenes
Series Three Deleted Scenes.mp4 <- season level extra of type "deleted scene"
TV Shows <- the folder linked to your tv-show library
Black Books
Bernard's Letter-scene.mp4 <- show level extra of type "scene"
Season 01
Series One Outtakes-behind.mp4 <- season level extra of type "behind the scenes"
Season 02
Series Two Outtakes-behind.mp4 <- season level extra of type "behind the scenes"
Series Two Deleted Scenes-deleted.mp4 <- season level extra of type "deleted scene"
Season 03
Series Three Outtakes-behind.mp4 <- season level extra of type "behind the scenes"
Series Three Deleted Scenes-deleted.mp4 <- season level extra of type "deleted scene"
You can mix both modes… personally I use the inline version if there’s only 1 item per type. If there’s more items per type I find it easier to organize them in their own subfolders (keeps the folders more neatly organized)
As of today, only the Plex apps for Android (mobile) and iOS are able to show extras on all levels (show/season/episodes). The Apple TV client will also show extras episode level – all other apps will currently only show the extras on the show level.
Edit: fixed a typo in the “extra type subfolders” (Scene → Scenes)
Just to confirm, I need to be using the beta agent for local extras to work?
i.e. this won’t work?
If so, this article might need updating to note this: Local Files for TV Show Trailers and Extras | Plex Support
(As I only discovered I needed to use the beta from this forum thread)
Is there an ETA on when this will move into GA?
Thanks!
The Plex TV Series agent should be regularly available for PMS 1.23.0 and newer.
Yes, as per the screenshot, I’m using the Plex TV Series agent. My question is whether I need to use the beta version of the agent (as noted in this thread)?
Beta is no longer needed.
Ahh ok thanks for confirming!
Ok, either there is a bug or i’m doing something wrong…
Following the advice in Local Files for TV Show Trailers and Extras | Plex Support and your post above, I’ve arranged my file structure as follows:
However, the extras don’t appear at either the show, or season level.
Is this example a bug or am I doing something wrong?
Your example looks overly complicated and I’ve seen the new agent to stumble occasionally with overly complicated file names.
Let’s get this sorted…
If you want to treat all those files as extras for Season 1, let’s start by getting rid of all the obsolete file name elements. Also… let’s properly associate them – they’re not Other type extras!
The Thick Of It
Season 01
Behind the Scenes
Stills Taken by Peter Capaldi - With Commentary.ext
Stills with Commentary.ext
Deleted Scenes
Episode 01.ext
Episode 02.ext
Episode 03.ext
Episode 04.ext
Episode 05.ext
Episode 06.ext
...
Where .ext is your respective file extension (here: .avi).
This should also help prevent endless bands of text as title of your extra.
Next… ideally you should handle episode level extras as extras for those episodes – not as season extras. This will even help with the clients currently supporting extras…
The Thick Of It
Season 01
Behind the Scenes <- season level extras
Stills Taken by Peter Capaldi - With Commentary.ext
Stills with Commentary.ext
The Thick Of It - s01e01-deleted.ext <- episode level extra (1x1)
The Thick Of It - s01e02-deleted.ext <- episode level extra (1x2)
The Thick Of It - s01e03-deleted.ext <- episode level extra (1x3)
The Thick Of It - s01e04-deleted.ext <- episode level extra (1x4)
The Thick Of It - s01e05-deleted.ext <- episode level extra (1x5)
The Thick Of It - s01e06-deleted.ext <- episode level extra (1x6)
...
Keep in mind: for episode level extras, the base filename must be a complete match of the actual episode file. If your episode file contains additional stuff like episode titles, those need to be in the extra file as well!!
I’m currently copying the episode file name and only amend it with the extra-type suffix (here: -deleted, no extra spaces or other changes) – this helps avoiding typos 
Thanks very much for your help!
So, I wasn’t actually intending for Plex to recognise or categorise the different types of extras. I just wanted them to be of the generic “other” type.
I can’t be bothered categorising them, or associating them with individual episodes (season level is fine), I just want them to appear.
I had thought based on the documentation/your comment that if you put them all in an “other” folder they would all be picked up regardless of the file name. This is the way it works with movies, and how I deal with movie extras. i.e. just “toss” everything in an “other” folder.
Given you noted the complicated file names might be confusing the agent, I tired making things simple:
Unfortunately, none of them show up still… 
Make sure you’re checking this with an Android phone or iOS device. That’s the only devices that’ll show extras on the season level (for now).
Other clients won’t show them at the show level?
I’m checking with the web app. They won’t show there?
No, at least not yet.
Plex have commented they’re working to show the extras for all/more tiers on the other apps but no ETA for when that’s going to happen.
ahhh!
ok, thanks!
So if I rename them back to how they were before (so I know which season they belong to when browsing), and toss them all into an “Other” folder at the show level it should work?
i.e.
The Thick Of It
Other
<extras>
?
It should but it’ll get messy (especially since there’s a known issue w/ extras not being sorted)
