Mirror attachments from forums

Hello,
In the media gallery I have a Music category and a Music node in my forums.
In the music category of the media gallery, the "Mirror attachments from forum" option is selected on "Music".

A video inserted in one or the other is inserted correctly, but remains only where it was inserted.
If I insert a video in the music forum (share link from youtube), I don't see it in the "Music" media gallery.

Any help?
regards

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