Tell me more about "PC AppCompat Buckets"?

After reading this article, PC AppCompat Buckets section:

I did understand almost nothing.

I did understand that this is somehow used for PC graphics/textures customization. But i didnt understand how exactly… I’ve seen file: Engine\Config\BaseCompat.ini, but i didnt understand how to use it.

My Game\Config\DefaultEngine.ini doesnt have any AppCompat sections.

In short, i didnt understand how to customize TextureGroups with AppCompat, or how to setup/use AppCompat at all.

Hi newbprofi,

Thank you for your report. We were not able to investigate this on the engine version you reported, but there have been many version changes to UE4 since this question was first posted. With a new version of the Engine comes new fixes and it is possible that this issue has changed or may no longer occur. Due to timetable of when this issue was first posted, we are marking this post as resolved for tracking purposes. If you are still experiencing the issue you reported in the current engine version, then please respond to this message with additional information and we will investigate as soon as possible. If you are experiencing a similar, but different issue at this time, could you please submit a new report for it.

Thanks very much!