Hi @GeradCouse,
Thanks for reaching out to the Community!
Attachment permissions and who can view those is based on their notes permission settings. The default is for notes to be set as viewing only notes that they own/created. If these users need to see attachments added by other users their notes permissions need to be updated to allow them to view notes from either their team or everyone.
Let me know if the user has these permissions.
Best,
Diana