I wish SkyBox would just look for cover images (Like poster.webp, cover.jpg, thumb.png, etc) placed next to media files on SMB servers before going off and generating it's own. The covers it generates are never as good as the ones I have on my server, which Jellyfin sees and uses, and even then, it takes extra time for it to generate them.
I like SkyBox way more than Pigasus, but that is a feature that Pigasus has which I do miss when I use SkyBox.