Chinese subtitles > Jellyfin

[makem]

I am able to 'acquire' subtitles in a language, eg. English, and convert it to Mandarin for a series. I can get Jellyfin to recognise the file by adding .zh.hi prior to the '.srt'. The file is then detected in Jellyfin and displayed. eg Better Call Saul.zh.hi.srt

If I do the same for a movie English .srt Jellyfin does not detect it. eg Oddity.zh.hi.srt does not get detected

Is there a different 'identifier' for movies?