Does this work in blender 3.6?
Unfortunately, due to changes in Blender specifications, it does not work with the latest version.
As stated on the Blender Market product page.
Doesn’t work in Blender2.93～
This add-on does not work due to the specification change of Blender2.93～.
(as of Addon ver2.0.50 / 2021-08-24)
The thumbnail menu cannot be displayed normally.
I think it is better to use the “Pose Library” add-on, which is a built-in Blender add-on, instead.
Or here’s the new non-thumbnail pose library addon I made.
Pose Folder - Blender Market