This file didn't play properly for me. Every time the scene changed, I got a black screen and my TV displayed the screen resolution and the Dolby Vision logo. . . . downloading the other 4K file now.
Avoid the FLUX 4K rips if playing back on a Firestick - they use a Dolby Vision profile that is not supported and you get the first quarter of the picture displayed as the last quarter. Check Reddit for more info! I forget which profile it is (8.1 perhaps. . . ) but more uploaders are using it and Amazon have been aware of the issue for 2 years and nothing is being done.