ReadCube Papers Mobile retains a significant amount of its functionality when used offline - you can still access your library, annotate, and read articles. You will not be able to sync your library when offline, though.
Download Single PDFs
To download an article for offline viewing either click the Download From Cloud button from your library or viewing the description of the article.
Articles you select for download will automatically be placed in the Download Queue. You can check your queue by heading to the Settings icon > Show Download Queue
Download All PDFs
You can now download all PDFs to your mobile device. To do so, head to Papers Settings on the left-side navigation panel.
Then, head to Other > Download all files. All your PDFs will begin to download from the cloud onto your local storage.
To remove any downloaded PDFs from local storage select Remove Downloaded PDFs.