[CastagnaIT]

I have installed version 14 beta  from a link above in a Nvidia Shield (capable of Widevine L1).
Nvidia is connected via HDMI 2.0 cable to Onkio Receiver Atmos enabled and then, always via HDMI 2.0, connected to a Samsung 4K TV. 
Copied an verified (THREE times!) the ESN from Netflix appl.
Enabled HEVC profiles in addon settings.
Enabled Dolby profiles in addon setting.
Disabled Dolby vision (I haven't TV capable of handling this setting)
I can't find the option to enable Atmos.

No 4K option ("only" 1080) and no Atmos option.
I know that "Velvet buzzshow" has Atmos  but have "only" 5.1 track playable.

Where can I find the option to enable Atmos?
Why I can't see the 4K video option?

Thank you to CastagnaIT!
Very well done work with your beta!
Your beta files is the only one that has made me possible to see Netflix on Kodi!
Thankyou again!

 first make sure that:
In Nvidia setting:
Shield setting -> Display & Sound -> Advanced settings -> Surround Sound -> Set to Always

Only after in kodi audio settings:
Enable TrueHD passthrough

In Netflix addon v14.0 dolby atmos is enabled by default
if in the netflix addon settings, in the Expert page is enabled "Use Dolby Sound".

Unfortunately, I don't have a 4k display to make test i can't help you for this purpose,
I read in some posts that increasing the min/max bandwidth of the adaptive input stream help to force higher resolutions