Then , you can't imagine how many variables your question involves...
A video file is not like a PDF or a XLS whom you always know how to open: what counts in a video file are the codecs used to create it (and encode it, indeed).
So, your problem involves not just the receiver, but also the image used will be responsible of the result.
I got curious by your post about this Atmos videos and I downloaded one of them (titled Core Universe) from a Demo website.
It perfectly works in my configuration: Solo4K, OBH 4.3 with ServiceApp plugin installed and ServiceExt3Player as default player.
But maybe that other images or configurations might not be able to play it, even with the same decoder.
The word of video files is very, very deep and complex!...