It is an application for displaying PDF files. By calling this app when opening a PDF file from another filer app, you can display the PDF file. Also, this app is required to open a PDF file from the bookend app. *Due to changes in security specifications on Android 11 and above, PDF files cannot be opened directly from this app. Select and open this app when opening a PDF file from another filer app. - View PDF - Search in PDF - View PDF Table of Contents - Supports links in PDF - Supports playback of videos (mp4) embedded in PDF - Supports single page and spread (cover setting) - Supports switching between right binding and left binding - Support thumbnail display - Support annotation function