Line art to Underlay layer

Is there an easy way to move line art to the underlay or overlay layer aside from simply copying and pasting the content on each frame?

I’d like to use Pencil Check Pro to create the roughs of the drawings (but Pencil Check Pro doesn’t have underlay/overlay), but I’d like to have an easy way to transfer it to the underlay when I get it into Animate Pro…

Is there a script from this? Any help would be nice…

Thanks!!!