Can't apply Override to Pose hierarchy in Blender

I imported a CC character to Blender. I then linked that character into a scene in another file.

I then applied an override to the character so that I could pose it in the scene. However the Pose hierarchy refuses to be overridden. So any changes I make to the pose will not be saved.

How can I overcome this? The alternative is to import the character into every scene which would be very inefficient.

All help appreciated.

Cheers

Hi,
could you please provide a video of your workflow along with the error message you received?
This will help us identify the issue more quickly. Thank you!