If you've purchased an article through ReadCube Checkout - you likely will receive a note that your article has been synced to your ReadCube Papers library.
Head to ReadCube Papers and you can find your purchase conveniently synced to your library or through your account page under Purchase History.
By viewing articles within ReadCube Papers - you can enjoy the Enhanced PDF experience - even offline!
To find out more on how to import your existing PDFs into ReadCube Papers - check out this support article.