I signed up for a trial of Pro to use OneDrive since iCloud library support doesn’t exist. You can add individual folders on Mac or iOS devices, but that leaves Apple TV wit no access. Unfortunately, I then found that the app wants read/write access to my entire OneDrive. Absolutely not. Still works great if I browse to files in the Files app and Open In > Infuse, and it’s nice that it would sync cross platform if I wanted to give it such broad access. But not supporting iCloud storage for the apps Library and providing access to that via Apple TV is a big L for me.