[Zuikkis]

Sorry if I don't know "in a nutshell" means but I guess the right question from me and @Zuikkis would be: can Amazon VOD addon play 4K and HDR content through Inputstream and if so, what are the right settings? Thanks.

Read this. It looks like this problem was caused by Covid lockdown to save bandwidth: https://github.com/Sandmann79/xbmc/issues/51

What ever happened with this issue? Is there a limitation for 4K in the way the plugin retrieves data from Amazon? On the Prime Video app the 4K works normally, and the content in 4K is labeled, but not in the plugin, is this a limitation of the Amazon API, or the plugin itself? I guess if Kodi doesn't know that the content is in 4K, the option "Use the android app for 4K" will never work...

Thanks in advance!

Yeah. On Android, the plugin is limited to 1080p. On PC even that is not possible, usually just 540p..

"Use the android app for 4K" does not work. You can use the Android app for everything though, that works. However there is a bug that you must disable framerate matching. This is fixed in current github sources but not in the released version.

It should be noted however, that some 4K primevideo streams are so low bitrate that often 1080p looks better. Wheel of Time for example, much better in 1080p. In the Primevideo app there is no way to force 1080p, so I use Kodi for those shows..