Performer Question: " ... I understand that if I "Allow my Portfolio to be public", then anyone can access it. If I don’t allow it to be public, can Casting and Agents access it nonetheless? Or will they not be able to see it unless I have it "public"?

Answer: Casting directors and Agents always have direct, one click access to your Advantage profile when they are logged in to Agencyclick, even if the profile is set to "not public". The screenshot below shows a typical panel from the Agencyclick Casting Director list view with the link to the performer's Advantage portfolio highlighted: