The link I provided goes to a thread where James says in a nutshell that the MacOS beta version of Infuse will not sync with iOS, tvOS versions 6.X. It will sync once the iOS and tvOS version 7 is released.
Hello. I guess I have the same issue. One atv 4k with everything updated. Recently I used another one which hasn’t been used like 2 months and since the new version (7) It doesn’t sync anymore. Same with my iPhone. I need to add each folder en both devices.
It had been 3 hours and the library was still empty. I tried rebooting my Macbook Pro and disabling/enabling iCloud sync and still no luck. The Macbook Pro is hardwired to the same network as my iPhone, iPad, and Apple TV 4k which Infuse 7 is synced across.