The error "User not authorized" appears on NOW mobile app when trying to add an attachment to the catalog item.Issue When a non-admin user is trying to add an attachment to the catalog item in the NOW mobile app, the error "User not authorized" appears and the attachment is not added.Cause1. The users with snc_external role will not be able to add attachments unless the system property: allow_snc_external_attachment_access is set to 'true'.2. The Catalog item widget may be customised.Resolution1. To allow access to the attachments to the external users, create the system property : allow_snc_external_attachment_access and set it's value to 'true'.2. Make sure that the widget used on the page is the OOTB SC Catalog item widget.Related LinksEnable external users to access attachments Mobile external users