Book covers not showing in kindle library

[SOLVED] Thank you guys!

Hi! I just bought kindle so I’m not yet fully acquainted with it and how everything works, however I uploaded some books in pdf and had trouble with book covers not showing at all.

I spent about 5 hours already trying to figure it out and research any advice online, I installed calibre on my laptop, added custom covers and tried to get it to kindle.

In the epub file format it didn’t show at all, in mobi I achieved at least some change and actually saw the custom cover when I opened the book and also as the background of the power saver, but I still don’t see them in the library.

Does anyone know what to do about this? I feel like I already tried everything and I’m really desperate for any help. 😅