Scanning subfolders

[marcs]

Hello,
I am new to Jellyfin
I installed it on a Synology NAS where I have some movies organized like that :

video (main folder)
somemoviehere.mp4
--Some Folder
---somefilm.mp.4
--Another Folder
---some subfolder
----someotherfilm1.mp4
----someotherfilm2.mp4
etc.
Jellyfin found movies in first level in /video, also folders in /video, also movies in /video/some folder but did not found subfolders neither films in /video/some folder/some subfolder

I did not found how to tell him to scan /video > /folders > subfolders

Any idea to help please ?

Cheers