Getting blank Document body while retrieving the values using fetch, QueryExpression.

Trying to clone an annotation record in CRM however, while cloning facing an issue in copying Documentbody. Getting document body as null while retrieving it through QueryExpression/Fetch. Steps tried-

1. Retrieving all attributes of annotation record basis objectid -  Got document body as null.

2. Retrieve documentbody basis annotationid - Still no luck.

PS

Annotation Records are getting created, attachment is also attached but document body is of 0 bytes.