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Can't add mp4 item to playlist via API - Printable Version

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Can't add mp4 item to playlist via API - miky - 2025-07-01

Hello,

version 10.10.7 , docker install

I'm trying to populate playlists using the API.
- Using the Jellyfin web interface i'm able to create new playlists and add my music videos in them, several or one item at a time. 
- Using the API I'm able to create a new playlist with one or more .mp4 (music videos) but i'm unable to add new items (.mp4) to the existing playlist. I do get a 204 response and no error code but the added Items do not get added to the playlist.
What could be the issue ? When troubleshooting with ChatGPT, it suggested that although it is possible to add videos in a playlist through the web interface and when creating a new playlist via the API, the API might silently fail when adding video items .

Thank you