Hello,
I’m working on a 3D project and used flipbook only once for this test so pardon me if my explanations are not very clear.
Disclaimer: I don’t know what is a paper flipbook, is it the same as just a flipbook texture ?
What I did is create a flipbook texture, made a material out of it, checked things like “used for UI” for example to prepare the material…then assign the material in UMG and it worked.
But it only works in viewport, I’ve been unabled to make it work as a 3D widget.
Hope it helps.