1. When you download PDF files in other app, the files will automatically store in PDF Reader Pro;
2. You can search the file by searching file name. If you don’t find the file, just restart PDF Reader Pro;
3. Or you can open the PDF file in the third-party channels, such as Dropbox, Skype, Wechat and etc, open the file and click more icon and choose Open in Other App, then select PDF Reader Pro.