Recent reports have shown that certain posts and stories are appearing in a noticeably degraded quality.
To fix this problem you’ll need to look into the settings of the application. To access the settings, you need to navigate to your main page and observe the three horizontal lines located in the top right corner. Once there, you can access your “Account” and in the submenu, you’ll find “Data usage”. When there, make sure that “High-quality uploads” is ticked.