Users see the message to install the plugin npClipboardDataPlugin
This can be configured within the configuration of the Attachment Flex Control
1. Log in under the Admin role
2. Click on Configure Application
3. Click on the business object that has the control
4. Click on Forms and open the form where the Attachment flex control exists
5. Set the values 'Can add', ,Can delete', and 'Can paste' to 'False'
You can also remove the attachment control from the form.