File Check Out After Creation CAD

Hi All, I'm trying for checking out attached File(just Viewable File PDF) in CAD to Server Machine using AfterAdd Server Event of CAD ItemType, to push to another app as a record. I fill CAD Data and attached file and save CAD. Then, I get this issue (ServerFile with id XXXXXXXXXXXXXXXXXX cannot be found in any of its containers. File with id XXXXXXXXXXXXXXXXXXXXXX cannot be found in any of its containers). I thought Files are already in the Vault Server at AfterAdd Server Event , really it wasn't. Can some one give any idea,please? Or Can I get Vault Server's physical file location and upload directly directly? Thanks, Thiha Swe Myanmar