My end users are not able to add an attachment to a Case they open. They can see the Attachment related List but don't have the Add Attachment button. It's only visible to System Admins. FYI: they have "Create, Add, Edit" permissions on Case, but not Delete.
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1What are your Sharing Settings for Cases? – Alex Tennant Jul 8 '14 at 9:24
Because the are not the owner of the case they can not see the button
