Samsung's new mobile devices – Galaxy S8, Galaxy S8+, Galaxy Tab S3, and Galaxy Book – feature high-resolution screens that are capable of displaying HDR (High Dynamic Range) content. However, finding HDR content is proving to be a tough task. Even Netflix hasn't started supporting these Samsung devices for HDR video streaming. However, a Redditor has compiled a collection of thirteen HDR videos that work with the Galaxy S8 and S8+, and you can download them.
All these are 10-bit 4K HDR (HDR10) videos from BBC Planet Earth, LG, Samsung, and Sony, and they're HDR10 standard compatible, so they'll work find on the Galaxy S8, Galaxy S8+, Galaxy Tab S3, and the Galaxy Book. Make sure that you increase the brightness to 100% and change the display mode to AMOLED Cinema from the Settings menu. It will work with Samsung's stock video player. You can download these videos from the source or via links below.
Note: If some of the file names of these videos are not ending with .mp4, change it to .mp4 from the file manager and it should work properly. These videos can't be played properly with third-party video players. You have to use Samsung Video Player.