3D FlipBook - Why yhe thumbnail with lightbox version, the thumbnail will look a bit pixelated?

Default thumbnail is first page of PDF. Try to use a custom image.

I already use a custom image with hires image but still blur. can advice more?

Try this way https://www.youtube.com/watch?v=40UAZgebTNU

Hi thanks for the method. issue resolved. But another issue, my last piece of the pdf was keep distorted. > http://thirdave.sg/sta/features/ . Screenshot: http://prntscr.com/md5h1v

the page distorted only appear on the last 2 page

Where can i find this document?

i figure out already. :) thx