Not syncing across devices
I was working on the work desktop, where I downloaded every PDFs and organized the articles in a library. When I came home, I found that my MacBook is not synced with the recent additions. It however shows the title of the articles, but does not show the PDF inside. Please suggest solutions.
Upgrade Storage
Note that you're at exactly 2 GB of usage. You've increased your storage quota, but you'll need to actually sync the computer where the files were added so that they're uploaded before those files can be accessed on other devices.