I'm glad I'm not alone.
I've Been pulling my hair pin pointing it to a potential Skybox Issue . I tested it with 2 system, amd, Intel and 4 Gpu 1060, 1080, 3070, 3080. Conclusion:
Any video above 2300p just won't show up in it directory using RTX 3000 series. Plug back a Gtx 1000 (or i assume any 2000) series card and every thing show up and play nicely.
Fun fact, swiping card back and forth testing, a 6k file ended registered in Skybox history tab and could be then access and play with 3000 series flawlessly, but still won't show if you browse to it's directory! So it's not a question of being able to Play these files, It can. Skybox just purge out 2300p and above when listing directory. No idea why!
Tested on oculus software V24, Skybox 1.0 and Nvidia 460.89