When you first open the ReadCube Papers mobile apps (iOS/Android) your library will be blank. Here are a few ways to begin populating your library.
Sync from Cloud
Easily transfer your library from the web or desktop apps. To do this, you must have already imported, indexed, and synced your PDFs into your Papers library (see: How do I import my PDFs into ReadCube Papers?). Syncing should start automatically, but you can always force a sync from the Settings menu in the top right.
Directly add articles within the Papers mobile app from the internal search database. Head to Search and begin typing any keyword, author, journal, etc. The mobile app supports boolean searching as well. Your recent searches will be saved so you can easily create new searches.
To add articles, select any entry to head to its information page. From there you can select Add to import the reference directly into your library. To include the PDF in your library select Locate PDF.
If you need to add an article directly to a specific list, select the folder tab in the right-hand corner and choose the appropriate list.
Under the Discover tab, you will also be able to see any Recommendations based on your Personal library. You can sort by a specific List to view similar articles based on the ones already in that folder.