7.0.2 EWM - Rename an attachment
One answer
I don't know about a way to do it manually.
The Attribute Customization API does not allow anything with attachments as far as I can tell.
The Plain Java Client Libraries and the EWM SDK use the interface: com.ibm.team.workitem.common.internal.model.Attachment it has getter and setter that would allow this as far as I can tell.