3D Flipbook help please!

Hi everyone,
Hoping someone can help me.
I’ve downloaded 3D Flipbook and today have downloaded the shelf add on.
When I go to add flipbooks to the shelf there is nothing showing to add. I have added flipbooks in the usual way and would expect them to be there to add to the shelf but am I missing a setting somewhere or something?
Would very much appreciate some help.

It’s now working - ! seem to have solved it myself! Unless some secret website elves have been working behind the scenes somewhere - tee hee