When you first click to view a PDF on Android, you'll be presented with an option of which application you'd like to open it in. You need to select a supported browser, including Chrome or Firefox, for the PDF to display properly.
After you've made your selection the first time, Android remembers it and no longer prompts you. If you made an incorrect selection, you have two options for resolving this:
- You'll want to reset the default on your phone by going to Settings -> Apps -> All -> the app you wish to remove the default action for, then scroll down and tap "clear defaults".
- Try deleting and reinstalling Notejoy, and then re-choosing its default for PDF display.