Saving super blocks to the xcos palette in version 2025

Not sure how this is supposed to work. Following the most current documentation I am able to find the process fails as blocks cannot be dragged to a user created palette. I did try to use the open icon in the xcos palette to add a xcos file with the super block in it and that seemed to work only now xcos complains that my palette is corrupted if I try to get help on a block.
A little help so I am not guessing anymore.