I have a few albums in my iTunes library that have never been able to sync over to my phone or tablet, all 24bit audio ALAC files. I'd need to either get a 16bit CD quality version or convert the files to 256kb/s (which I detest doing as it defeats the purpose). Suddenly in the latest iOS 11 beta they sync over! Could this possibly be hinting at Apple preparing to implement high-fidelity audio options in the iTunes Store? If so, I'm so down for that! I've known for a while that the DACs in the iPhones support higher quality files, but you had to use third party workarounds to get your music to play on iOS. It seems this is no longer the case as I even have 96.000kHz 24bit audio files synced over. It's always been a pain deciding if I want to convert things down just to have it playable on my device or keep my on-the-go music lossless as well.