I've just purchased pro version of Emby in trial to see if I could replace Plex with Emby.
But my first test was not really a success.
I've tried to sync some content on my iPad in original but the transfer never begin (stay at 0%).
The same happened on my iPhone.
Also I've tried to do it with transcoding and my first impression is that's quite long and after that nothing happen neither.
Bot of my devices are in latest version of iOS.
Is there something to do in order to make it works ?