Problem file syncing in group

I have a problem with file syncing in a zotero group. The syncing of references does work but not the file syncing.

Syncing in the group is enabled in the settings and the one who has uploaded the reference can open it in Zotero but the other can not. The one who can not open the file can see the pdf icon but is it lighter in color and kind of see through.

What can we do?
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