The extension point AttachmentListManipulator is a java interface that can be implemented to manipulate the list of attachments available to the agent during message processing.
Your plugin may add additional attachments and filter available attachments. Both methods are invoked with an
AttachmentFilterContext as parameter allowing access to the current user and to the current issue to determine whether an attachment should be visible.
Important: Adding attachments always requires to also provide an AttachmentDataSourceProvider responsible for providing the binary data of the attachment to any process at any time.