PDF Reader Pro for Windows supports the Autosave feature that can save your files automatically within a few seconds as you work. However, Autosave should be enabled manually rather than by default.
Follow the instructions below to turn Auto Save on:
1. Run PDF Reader Pro -> Go to Home screen;
2. Click Settings in the sidebar;
3. In the General tab, you will see Auto Save that is currently off at the bottom;
4. Click the Auto Save toggle to switch Off to On, and now the Auto Save feature is enabled.