Zotero Group not syncing (some items not accessible to team members) Inbox x

I'm an admin for a Zotero group https://www.zotero.org/groups/2522212/hlpe_16_youth_report
and the members are not seeing some of the files that I upload

Report ID: 1857002077

Two team members (including the owner) cannot access this reference (and several others) - please see attached:

If we are out of storage, how do I see that?
If it's something else, how can I troubleshoot?
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