How to restrict the attachment type on the instanceIssue To restrict the Attachment for the entire Platform by using the below steps: Navigate to System Properties ➔ Security.In the Attachment limits and behavior section, locate the List of file extensions (comma-separated) that can be attached to documents via the attachment dialog property.Enter the file extensions and click Save. NOTE: It is not possible to limit the attachment type exclusively for the service catalog, as the attachment is not specifically assigned for the catalog, but rather inherited from the platform.