[iPhone12 Pro Max] Youtube video quality and loading issue

Any user facing this issue now? When I shot videotape in 4K horizontal and uploaded via YouTube App, it seems quality was restricted.

When I try to playback the video via Youtube App on iPhone, it shown me error. Can only view via phone browser.

Youtube App:

Phone safari :

Video shots vertical:

Edited version manage to show 2160 HDR but original version only show 1080.