I downloaded a few videos with yt-dlp, had it embed the thumbnails, but what do I need to do to have Thunar actually use these thumbnails?

I’m on EndeavourOS, tumbler is installed, as is ffmpegthumbnailer and atomicparsley. Though the images have also been embedded just fine even before I installed the latter.

VLC shows the correct thumbnail image when looking at the media properties/informations, so it’s definitely there.

Do they need to be a specific format, maybe?

I feel like I’m missing something super obvious