OnSong has the ability to view many types of files. While the most popular file types are text-based chord charts and PDF files, you can also view Microsoft Word, Pages, images, and many more. However recent changes in iOS/iPadOS have changed the component that OnSong uses to view these files and in a way that makes annotations and drawings less reliable.
Starting in OnSong 2020.8.4, we've added the ability to view these file types as PDF files. That tells OnSong to convert these various files into PDF files which makes viewing of those documents much more consistent. In addition, it allows you to view those file types in low light mode or to tint the display colors. It also gives us the ability to attach annotations and drawings to the document more consistently.
If you're experiencing issues with annotations shifting or not attaching, try the following:
Turn on View Files as PDF
Go into the Utilities Menu in the menubar by tapping on the gear icon. Next, tap on Settings and navigation to Display Settings and then Song Viewer. Locate the Renderer section and ensure that the View Files as PDF switch is enabled. Now when you view your chart, it will automatically be converted to a PDF file.
OnSong works best with text-based chord charts so if your song document can be converted to a text-based file, you'll have more features of OnSong available to you like formatting options, lyrics projection, low light mode, and much more. You can learn more about doing this in our best practices article.