There are no 4k support for sony's phone after z3. I wonder if your team is working for it.

Once I got the reply from technical support claimed that it was sony's restrictions for third part's app. Later I found that many thrid party apps are supporting 4k video without root. That means your technical support was giving me a fake answer. I hope that the coming frimware update will add the 4k video for sony's phone!

There are no 4k support for sony's phone after z3. I wonder if your team is working for it.

Once I got the reply from technical support claimed that it was sony's restrictions for third part's app. Later I found that many thrid party apps are supporting 4k video without root. That means your technical support was giving me a fake answer. I hope that the coming frimware update will add the 4k video for sony's phone!