How do I change the media picker thumbnail url? I have created a custom file system that uploads my images to cloudinary. This all works fine in the media tab and it shows the thumbnail properly.

However on the media picker, it tries to show the thumbnail using /umbraco/backoffice/umbracoapi/images/GetBigThumbnail?originalImagePath=

And when it does this, I get a 401 error:

{"Type":"https://tools.ietf.org/html/rfc7235#section-3.1","Title":"Unauthorized","Status":401,"Detail":null,"Instance":null,"Extensions":{"traceId":"00-36daab07986ca5965a38677b51b501dd-dcb8871c6d7b7302-00"}}

Is there a way to change the thumbnail url on the media picker so that it match so it matches the thumbnail url used in the media tab section?