Requirement to write (Storage Manager) web service calls to perform a file upload associated with a Legal Document attachment record.
There is no ITAM web services documentation that is helpful for this use case.
CA Asset Portfolio Management (ITAM) 17.3 and 17.4
The File Upload functionality is a part of the Storage Manager Service which is designed and used internally by the ITAM (UI) for uploading file attachments to different objects.
Unfortunately, this is not exposed as an endpoint for external client systems. For the same reasons, there is no available documentation on how to build web services calls.
The only available and supported endpoint from ITAM is the WCF Services and they support only 7 methods (see screenshot below).
To achieve the requirement, suggest the files to be uploaded manually to the Legal document object through ITAM UI.