Why are Annotate options not available in Vault?
The permission to annotate is based on the specific document permissions for the document and lifecycle state that the document is in.
To annotate a document the user must have a role in the document that has the Annotate permission for that particular Lifecycle state.
Example: A document in the Draft state allows a user to annotate. However, after a workflow and state change to Approved, the user is no longer able to annotate.
Vault Help Documentation: