How to use SlideViewer

How to use https://play.google.com/store/apps/details?id=hm.orz.chaos114.android.slideviewer

Original slide is http://noboru-i.github.io/slide/201703-slideviewer/index.html

1. How to use SlideViewer
2. Please download! https://play.google.com/store/apps/details? id=hm.orz.chaos114.android.slideviewer
3. After install this app, When you open slideshare's url...
6. After tap back key, You can see history of slide list.
8. Other feature
9. OCR support